docs: Document supported package extras

[edgarrmondragon]

---

📚 Documentation preview 📚: https://meltano-sdk--2204.org.readthedocs.build/en/2204/

[codspeed-hq]

CodSpeed Performance Report

Merging #2204 will not alter performance

_{Comparing edgarrmondragon/docs/document-extra-features (e680e59) with main (2fbe530)}

Summary

✅ 6 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2fbe530) 88.46% compared to head (7d1dd02) 88.46%.

❗ Current head 7d1dd02 differs from pull request most recent head e680e59. Consider uploading reports for the commit e680e59 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2204   +/-   ##
=======================================
  Coverage   88.46%   88.46%           
=======================================
  Files          54       54           
  Lines        4716     4716           
  Branches      917      917           
=======================================
  Hits         4172     4172           
  Misses        383      383           
  Partials      161      161           

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