Implement Connection Pool API

[anrossi]

Description

Provide an API for pooling connections across multiple RSS cores

Testing

Manual testing

Documentation

Documentation will be updated with the new API

[codecov]

Codecov Report

Attention: Patch coverage is 73.27586% with 62 lines in your changes missing coverage. Please review.

Project coverage is 86.11%. Comparing base (d110cc8) to head (67b471b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/connection_pool.c	72.76%	61 Missing ⚠️
src/core/library.h	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4832      +/-   ##
==========================================
- Coverage   87.47%   86.11%   -1.37%     
==========================================
  Files          56       57       +1     
  Lines       17722    17951     +229     
==========================================
- Hits        15503    15459      -44     
- Misses       2219     2492     +273     

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