[DPE-4683] socket config flag

[dragomirp]

• Add configuration flag to use socket
• Pass socket endpoint and URI based on the config flag

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.05%. Comparing base (cb02311) to head (6d77cf2).

Files with missing lines	Patch %	Lines
src/relations/pgbouncer_provider.py	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #343      +/-   ##
==========================================
- Coverage   75.20%   75.05%   -0.16%     
==========================================
  Files           9        9              
  Lines        1319     1323       +4     
  Branches      239      240       +1     
==========================================
+ Hits          992      993       +1     
- Misses        254      256       +2     
- Partials       73       74       +1     

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[dragomirp]

vIP value will already control how exposed connections will behave, so adding config just for local connections.

[7annaba3l]

Let's rather have as possible values:
"tcp" instead of "socket"
"uds" instead of "local"