Use a custom prelude to improve compile performance

[paulcadman]

In this PR:

• Update to the latest stdlib that uses V2 Package
• Uses performance ref of juvix-test Improve performance by selectively importing parts of the stdlib juvix-test#3
• Moves tests to a separate package so packages that depend on containers no longer depend on juvix-test and another copy of stdlib
• Uses V2 Package in Package.juvix

Before:

$ time juvix typecheck Data/Map.juvix
Well done! It type checks
juvix typecheck Data/Map.juvix  8.24s user 0.11s system 99% cpu 8.403 total

After:

$ time juvix typecheck Data/Map.juvix
Well done! It type checks
juvix typecheck Data/Map.juvix  2.25s user 0.05s system 98% cpu 2.324 total