Source metadata

[TheTeaCat]

Adds source.metadata field to logs & populates it with the value "lambda-extension".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.72%. Comparing base (a6f269d) to head (d6af8e9).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   85.37%   83.72%   -1.65%     
==========================================
  Files          18       18              
  Lines         581      602      +21     
==========================================
+ Hits          496      504       +8     
- Misses         70       82      +12     
- Partials       15       16       +1     

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