Make PostgresClient API

[fabianfett]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c75349f) 61.86% compared to head (8c24d1f) 61.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #460      +/-   ##
==========================================
- Coverage   61.86%   61.82%   -0.05%     
==========================================
  Files         125      125              
  Lines       10014    10019       +5     
==========================================
- Hits         6195     6194       -1     
- Misses       3819     3825       +6     

Files	Coverage Δ
Sources/PostgresNIO/Pool/PostgresClient.swift	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[fabianfett]

The breaking changes are on SPI:

2 breaking changes detected in PostgresNIO:
  💔 API breakage: func PostgresClient.query(_:logger:file:line:) has parameter 1 type change from Logging.Logger to Logging.Logger?
  💔 API breakage: func PostgresClient.execute(_:logger:file:line:) has parameter 1 type change from Logging.Logger to Logging.Logger?