feat: expose config through admin api

[meskill]

Summary:
Briefly describe the changes made in this PR.

Issue Reference(s):
Fixes #2817

Build & Testing:

• I ran cargo test successfully.
• I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• I have added relevant unit & integration tests.
• I have updated the documentation accordingly.
• I have performed a self-review of my code.
• PR follows the naming convention of <type>(<optional scope>): <title>

[codecov]

Codecov Report

Attention: Patch coverage is 7.40741% with 50 lines in your changes missing coverage. Please review.

Project coverage is 87.47%. Comparing base (aab7e07) to head (4c78a4e).
Report is 48 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli/server/admin_server/server.rs	0.00%	43 Missing ⚠️
src/cli/server/http_server.rs	0.00%	5 Missing ⚠️
src/cli/server/admin_server/graphql.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2955      +/-   ##
==========================================
+ Coverage   87.43%   87.47%   +0.03%     
==========================================
  Files         263      267       +4     
  Lines       26422    27015     +593     
==========================================
+ Hits        23103    23631     +528     
- Misses       3319     3384      +65     

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[github-actions]

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