Add support for setting logo path in ProviderMetadata

[felixarntz]

See WordPress/gutenberg#76190 (which will make it into WordPress 7.0): We need to support setting an optional logo path per provider.

[github-actions]

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Co-authored-by: felixarntz <flixos90@git.wordpress.org>
Co-authored-by: gziolo <gziolo@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.48%. Comparing base (30a1506) to head (0e204b6).
⚠️ Report is 2 commits behind head on trunk.

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #219      +/-   ##
============================================
+ Coverage     87.45%   87.48%   +0.02%     
- Complexity     1194     1195       +1     
============================================
  Files            60       60              
  Lines          3858     3867       +9     
============================================
+ Hits           3374     3383       +9     
  Misses          484      484              

Flag	Coverage Δ
unit	87.48% <100.00%> (+0.02%)	⬆️

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[gziolo]

Perfect, thank you!