WIP: signed urls

[alvarowolfx]

Towards #3645

[codecov]

Codecov Report

❌ Patch coverage is 58.45272% with 145 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.15%. Comparing base (81b22e6) to head (3cc98f4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/auth/src/signer.rs	25.45%	41 Missing ⚠️
src/auth/src/credentials.rs	0.00%	36 Missing ⚠️
src/auth/src/credentials/impersonated.rs	0.00%	35 Missing ⚠️
src/auth/src/signer/mds.rs	0.00%	18 Missing ⚠️
src/storage/src/storage/signed_url.rs	94.90%	8 Missing ⚠️
src/auth/src/credentials/mds.rs	45.45%	6 Missing ⚠️
src/auth/src/signer/service_account.rs	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3828      +/-   ##
==========================================
- Coverage   95.14%   93.15%   -1.99%     
==========================================
  Files         162      166       +4     
  Lines        6116     6445     +329     
==========================================
+ Hits         5819     6004     +185     
- Misses        297      441     +144     

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