feat(repo)gcs: add support for versioning and retention

[guestisp]

still a WIP but this PR aim to add support for versioning and retention for malware protection to the native Google Cloud Storage backend

backup and retention extension are working as expected
point in time still doesn't work, probably i need some help in this regard.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 75.83%. Comparing base (e389d92) to head (22ab4e7).
Report is 124 commits behind head on master.

❗ Current head 22ab4e7 differs from pull request most recent head 2cb602f. Consider uploading reports for the commit 2cb602f to get more accurate results

Files	Patch %	Lines
cli/storage_gcs.go	33.33%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3564      +/-   ##
==========================================
+ Coverage   75.81%   75.83%   +0.01%     
==========================================
  Files         465      465              
  Lines       37171    37183      +12     
==========================================
+ Hits        28183    28199      +16     
+ Misses       7059     7056       -3     
+ Partials     1929     1928       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[guestisp]

Can someone help a bit ?