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

[holly-evans]

Description

Allow users to reference the stream name in stream maps alias fields, under a special key:

{
    "stream_maps": {
        "*": {
            "__alias__": "'raw_' + __stream_name__"
        },
}

Related

• Closes feat: Access stream name in __alias__ #2700
• Similar to feat: Support using the stream name or alias in the context of a stream map #2283 but __alias__ was not an evaluated field before now

---

📚 Documentation preview 📚: https://meltano-sdk--2701.org.readthedocs.build/en/2701/

[codspeed-hq]

CodSpeed Performance Report

Merging #2701 will not alter performance

_{Comparing holly-evans:issue-2283-use-stream-name-in-alias (4cbdfb1) with main (9bf104e)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.50%. Comparing base (9bf104e) to head (4cbdfb1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2701   +/-   ##
=======================================
  Coverage   90.50%   90.50%           
=======================================
  Files          62       62           
  Lines        4994     4994           
  Branches      974      974           
=======================================
  Hits         4520     4520           
  Misses        328      328           
  Partials      146      146           

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[edgarrmondragon]

This looks great, thanks @holly-evans!

[holly-evans]

@edgarrmondragon Added some docs! Left the version as TODO

[edgarrmondragon]

Thanks @holly-evans!