[confmap][PoC] - Showcase the use of yaml tags for merge append mode

[VihasMakwana]

Description

This POC PR implements the merging of lists by utilizing the yaml tags. This method makes very little changes to public API and completely relies on the information provided from the confi files.

We following these steps:

1. We go through the yaml tree and search for tags.
2. We keep track of current path and record the path to a "map", if user has specified merging tag.
3. Once the yaml tree is traversed, we go through recorded paths and merge the lists for those paths.

Relates #13256

[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.88%. Comparing base (74cb2f3) to head (46b4be3).
⚠️ Report is 137 commits behind head on main.

Files with missing lines	Patch %	Lines
confmap/merge.go	91.78%	3 Missing and 3 partials ⚠️

❌ Your patch check has failed because the patch coverage (93.10%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13551      +/-   ##
==========================================
- Coverage   91.50%   90.88%   -0.63%     
==========================================
  Files         526      599      +73     
  Lines       29436    31460    +2024     
==========================================
+ Hits        26936    28592    +1656     
- Misses       1971     2333     +362     
- Partials      529      535       +6     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[mx-psi]

I assume this is only needed for the test cases and not in an actual config file?

[VihasMakwana]

yeah, only for test file. I changed this because I wanted the config to be a "string" and not a map.

[VihasMakwana]

The reason for doing this:

If we don't specify this as a "string", the yaml tags would get lost in json translation.
In real world configuration, this would not happen because of obvious reasons (we load config from yaml file and tags are preserved).

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.