feat: add dependency metrics

[akashsinghal]

Description

What this PR does / why we need it:

Adds more metrics and accompanying dashboard additions:

1. Registry Requests: Count, duration, status code
2. Blob Cache Hit: Count, Hit percentage
3. AAD exchange: duration
4. ACR exchange: duration
5. AKV cert fetch: duration

Adds Grafana charts for additional metrics

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):

Fixes #773

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Local tests pass
• Dashboard are correct for test loads

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

Patch coverage: 74.73% and project coverage change: +0.55 🎉

Comparison is base (c3af806) 51.72% compared to head (97c2b7d) 52.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
+ Coverage   51.72%   52.28%   +0.55%     
==========================================
  Files          61       61              
  Lines        3555     3653      +98     
==========================================
+ Hits         1839     1910      +71     
- Misses       1529     1551      +22     
- Partials      187      192       +5     

Impacted Files	Coverage Δ
pkg/certificateprovider/azurekeyvault/provider.go	42.67% <0.00%> (-1.12%)	⬇️
...n/oras/authprovider/azure/azureworkloadidentity.go	34.24% <0.00%> (-1.47%)	⬇️
pkg/metrics/stats_reporter.go	79.31% <75.00%> (-3.85%)	⬇️
pkg/referrerstore/oras/oras.go	55.26% <100.00%> (+1.83%)	⬆️

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[binbin-li]

just one minor comment, lgtm overall