Add compression streams suite; migrate existing CS/DS tests

[jasnell]

More test consolidation/improvement. Comparing legacy C++ impl with TS

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

Consolidates compression-stream tests and adds TS write-time chunk snapshots.

1. [HIGH] Posted 2 inline review comments on PR Add compression streams suite; migrate existing CS/DS tests #7155.
2. Targeted test build was blocked by the environment’s missing libc++ headers.

github run

[jasnell]

Includes a fix for both compression and identity streams that was flagged by the AI reviewer.

[guybedford]

Nice suite — coverage is a strict superset of the deleted tests and the divergence pinning is exactly right. Two minor notes inline.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.97%. Comparing base (0e26ff0) to head (a796d03).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           jasnell/streams-test-consolidation-2    #7155      +/-   ##
========================================================================
+ Coverage                                 35.85%   35.97%   +0.12%     
========================================================================
  Files                                       811      808       -3     
  Lines                                    258802   257643    -1159     
  Branches                                  19572    19572              
========================================================================
- Hits                                      92802    92699     -103     
+ Misses                                   154924   153863    -1061     
- Partials                                  11076    11081       +5     

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