feat: Max cache size for StreamHub

[DaveSkender]

Implements:

• auto-prune in-memory stream data #1095

Copilot reviewed 5 out of 7 changed files in this pull request and generated no comments.

Files not reviewed (2)

• src/_common/Observables/StreamHub.cs: Evaluated as low risk
• src/_common/Quotes/Quote.StreamHub.cs: Evaluated as low risk

Comments suppressed due to low confidence (4)

src/_common/Observables/StreamHub.Observable.cs:101

• The new behavior introduced by NotifyObserversOnRebuild should be covered by tests.

private void NotifyObserversOnRebuild(DateTime fromTimestamp)

src/_common/Observables/StreamHub.Observable.cs:113

• The new behavior introduced by NotifyObserversOnPrune should be covered by tests.

private void NotifyObserversOnPrune(DateTime toTimestamp)

src/_common/Observables/StreamHub.Observer.cs:42

• Ensure that the PrunedCache test method in StreamHub.CacheMgmt.Tests.cs covers the behavior of the OnPrune method.

public void OnPrune(DateTime toTimestamp)

tests/indicators/_common/Observables/StreamHub.CacheMgmt.Tests.cs:203

• The test method 'PrunedAsymmetric' is marked as inconclusive. It should either be implemented or removed if not relevant.

Assert.Inconclusive("not implemented");