feat: Support stream aliasing of BATCH messages via stream maps

[ReubenFrankel]

Adds support for BATCH messages with __alias__ using stream maps - a small step towards #1117.

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📚 Documentation preview 📚: https://meltano-sdk--2667.org.readthedocs.build/en/2667/

[ReubenFrankel]

Wasn't sure how/where to test this from the target side. Open to suggestions!

[codspeed-hq]

CodSpeed Performance Report

Merging #2667 will not alter performance

_{Comparing ReubenFrankel:feature/batch-stream-maps-alias (82290ba) with main (170f5bc)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.87%. Comparing base (170f5bc) to head (82290ba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2667      +/-   ##
==========================================
+ Coverage   89.86%   89.87%   +0.01%     
==========================================
  Files          58       58              
  Lines        4885     4891       +6     
  Branches      960      963       +3     
==========================================
+ Hits         4390     4396       +6     
  Misses        344      344              
  Partials      151      151              

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[edgarrmondragon]

Wasn't sure how/where to test this from the target side. Open to suggestions!

I don't think there's anything we can base it off at the moment, but I'm happy to merge as is.

Thanks @ReubenFrankel!