feat: Azure Blob Storage Retriever

[Abeeujah]

Description

Azure Blob Storage Retriever to get feature flag configurations directly from Azure.

Closes issue(s)

Resolve #2558

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

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[thomaspoignant]

@Abeeujah thanks for your PR, I've made some comments and the PR needs some changes.

[thomaspoignant]

@Abeeujah Test are not passing can you look at it?

[codecov]

Codecov Report

Attention: Patch coverage is 59.75610% with 33 lines in your changes missing coverage. Please review.

Project coverage is 84.50%. Comparing base (41cccf7) to head (8d55d1b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
retriever/azblobstorageretriever/retriever.go	58.33%	20 Missing and 5 partials ⚠️
cmd/relayproxy/service/gofeatureflag.go	0.00%	7 Missing ⚠️
cmd/relayproxy/config/retriever.go	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2672      +/-   ##
==========================================
- Coverage   84.91%   84.50%   -0.42%     
==========================================
  Files         105      106       +1     
  Lines        4940     5021      +81     
==========================================
+ Hits         4195     4243      +48     
- Misses        588      616      +28     
- Partials      157      162       +5     

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[Abeeujah]

Hi @thomaspoignant my bad; I didn't update the tests after implementing the InitializableRetriever Interface; it's been fixed now, can you review again? all tests are now passing...

[thomaspoignant]

🚀 LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud