Kopia Integration:Kopia Lib - Initialization

[Lyndon-Li]

Add changes for Kopia Integration: Kopia Lib - initialize Kopia repo
Related Issue: #5077

[Lyndon-Li]

This PR resubmits changes of PR #5219 , refer to it for old comments.

[codecov-commenter]

Codecov Report

Merging #5231 (d58abb2) into main (775943c) will increase coverage by 0.23%.
The diff coverage is 57.40%.

@@            Coverage Diff             @@
##             main    #5231      +/-   ##
==========================================
+ Coverage   41.55%   41.79%   +0.23%     
==========================================
  Files         218      225       +7     
  Lines       18903    19172     +269     
==========================================
+ Hits         7855     8012     +157     
- Misses      10465    10574     +109     
- Partials      583      586       +3     

Impacted Files	Coverage Δ
...repository/udmrepo/kopialib/backend/file_system.go	0.00% <0.00%> (ø)
pkg/repository/udmrepo/kopialib/backend/common.go	22.22% <22.22%> (ø)
pkg/repository/provider/unified_repo.go	51.87% <23.52%> (-2.34%)	⬇️
pkg/repository/udmrepo/kopialib/backend/s3.go	53.84% <53.84%> (ø)
pkg/repository/udmrepo/kopialib/backend/gcs.go	55.55% <55.55%> (ø)
pkg/repository/udmrepo/kopialib/backend/utils.go	70.00% <70.00%> (ø)
pkg/repository/udmrepo/kopialib/repo_init.go	86.41% <86.41%> (ø)
pkg/repository/udmrepo/kopialib/backend/azure.go	91.30% <91.30%> (ø)

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