Enable embedding sources inside the sourcemaps json as sourcesContent

[vegegoku]

This PR updates the rebased version of sourcemaps jar and other dependencies to support embedding the source files content into the source maps sourcesContent field.

requires : gwtproject/tools#31

Fixes #9752 #9778 #9790

[niloc132]

Some updates from private chat working on this feature:

• We've learned that SDM won't be improved by this, as the various linking activity doesn't copy source files for in SDM, only in prod code with sourcemaps enabled. The "sourcesContent" part of this patch will only improve SDM in cases where the debugger loads many many sources, to the point where that network traffic could be time better spent reading a giant sourcemap file.
• This is still a legit way to slightly improve prod build times for projects that deploy with sourcemaps (not many, but they exist), though it might be counterproductive for those only using sourcemaps for stack trace deobfuscation
• For these reasons, we're leaning towards a config property in CompilerProperties.gwt.xml that would activate this new feature.
• The patch still has value simply by updating the sourcemap library: both to potentially fix any issues in the last 8ish years since this was updated, and to drop the server-side runtime dependency on protobuf once and for all.

There is also other cleanup possible for compiler.useSourceMaps (since it should work in all browsers today, and not need extra wiring in CoreWithUserAgent), but let's leave that to another patch.

[niloc132]

Description should be updated to indicate that this fixes #9752.

Edit: also #9778, #9790

[niloc132]

Looks like there may be more classpaths that should be expanded, or code that needs to be corrected to stop walking classes it should ignore (annotations mostly?)

Example from the build:

requestfactory-server:
     [java] Could not find class file for com/google/auto/value/AutoValue
     [java] Could not find class file for com/google/auto/value/AutoValue$Builder
     [java] May 12, 2024 4:55:17 AM com.google.auto.value.AutoValue
     [java] SEVERE: Could not find class file for com/google/auto/value/AutoValue
     [java] May 12, 2024 4:55:17 AM com.google.auto.value.AutoValue.Builder
     [java] SEVERE: Could not find class file for com/google/auto/value/AutoValue$Builder
     [java] Could not find class file for com/google/errorprone/annotations/CanIgnoreReturnValue
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.CanIgnoreReturnValue
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/CanIgnoreReturnValue
     [java] Could not find class file for com/google/errorprone/annotations/DoNotCall
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.DoNotCall
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/DoNotCall
     [java] Could not find class file for com/google/errorprone/annotations/InlineMe
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.InlineMe
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/InlineMe
     [java] Could not find class file for com/google/errorprone/annotations/DoNotMock
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.DoNotMock
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/DoNotMock
     [java] Could not find class file for com/google/errorprone/annotations/InlineMeValidationDisabled
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.InlineMeValidationDisabled
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/InlineMeValidationDisabled
     [java] Could not find class file for com/google/errorprone/annotations/CompatibleWith
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.CompatibleWith
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/CompatibleWith
     [java] Could not find class file for com/google/errorprone/annotations/Immutable
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.Immutable
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/Immutable
     [java] Could not find class file for com/google/errorprone/annotations/ForOverride
     [java] Could not find class file for com/google/errorprone/annotations/CheckReturnValue
     [java] Could not find class file for com/google/errorprone/annotations/RestrictedApi
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.ForOverride
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/ForOverride
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.CheckReturnValue
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/CheckReturnValue
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.RestrictedApi
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/RestrictedApi
     [java] Could not find class file for com/google/errorprone/annotations/concurrent/GuardedBy
     [java] May 12, 2024 4:55:17 AM com.google.errorprone.annotations.concurrent.GuardedBy
     [java] SEVERE: Could not find class file for com/google/errorprone/annotations/concurrent/GuardedBy

[niloc132]

Approved, let's merge the tools PR, and remove the CI changes here, and give everyone else another day or so to see if they have any last minute feedback.

[niloc132]

Sorry, still lots of build warnings, I think more dependencies need to be added (or the RF jar extractor tool updated to otherwise handle this case): https://github.com/gwtproject/gwt/actions/runs/9196862375/job/25295956029?pr=9936#step:6:592

[niloc132]

Confirmed that this is fixed, waiting for full build to merge.

[niloc132]

Passing build: https://github.com/vegegoku/gwt/actions/runs/9975626940/job/27565849685

[niloc132]

Full build after dropping gwtproject/tools workaround https://github.com/vegegoku/gwt/actions/runs/9978374423

[jnehlmeier]

Running GWT including this change in production sometimes results in a NPE. See comment in #9931 (comment)