Minor cleanups

[gwynne]

These changes are now available in 2.14.1

Bump Swift min to 5.10, update README and API docs, clean up some doc comments, run swift-format, fix warning about retroactive conformance in 6.2.

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 42.47%. Comparing base (a4212e1) to head (93cac3b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/PostgresKit/PostgresDataTranslation.swift	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #273      +/-   ##
==========================================
+ Coverage   41.84%   42.47%   +0.63%     
==========================================
  Files          13       13              
  Lines         865      871       +6     
==========================================
+ Hits          362      370       +8     
+ Misses        503      501       -2     

Files with missing lines	Coverage Δ
Sources/PostgresKit/PostgresDatabase+SQL.swift	76.56% <100.00%> (+1.98%)	⬆️
Sources/PostgresKit/PostgresDialect.swift	78.87% <100.00%> (+1.40%)	⬆️
Sources/PostgresKit/SQLPostgresConfiguration.swift	85.10% <ø> (ø)
Sources/PostgresKit/PostgresDataTranslation.swift	67.63% <92.30%> (+0.48%)	⬆️

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[MahdiBM]

some comments