feat(mappers): Stream name can now be accessed in stream maps

[holly-evans]

Description

Allow users to reference the stream name or alias in stream maps under a special key, similar to record and config:

{
    "stream_maps": {
        "*": {
            "source_table": "__stream_name__",
            "source_data": "record",
        }
    }
}

Add two tests for existing functionality of self and _ keys

Related Issues

• Closes feat: Support using the stream name or alias in the context of a stream map #2283

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📚 Documentation preview 📚: https://meltano-sdk--2699.org.readthedocs.build/en/2699/

[codspeed-hq]

CodSpeed Performance Report

Merging #2699 will not alter performance

_{Comparing holly-evans:issue-2283-use-stream-name-in-stream-map-context (e03465c) with main (c2f5a22)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.55%. Comparing base (c2f5a22) to head (e03465c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2699   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files          62       62           
  Lines        4997     4997           
  Branches      637      637           
=======================================
  Hits         4525     4525           
  Misses        328      328           
  Partials      144      144           

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[edgarrmondragon]

Thanks @holly-evans!