Some minor cleanup

[gwynne]

These changes are now available in 4.8.1

Simple stuff, really - add a .swift-format and use it, bump the minimum Swift version to 5.10, update the CI and the README. you get the idea.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.02%. Comparing base (6e3a5ff) to head (52cfb1e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rces/FluentSQLiteDriver/FluentSQLiteDatabase.swift	96.29%	1 Missing ⚠️
...rces/FluentSQLiteDriver/SQLiteError+Database.swift	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   81.69%   82.02%   +0.33%     
==========================================
  Files           7        7              
  Lines         213      217       +4     
==========================================
+ Hits          174      178       +4     
  Misses         39       39              

Files with missing lines	Coverage Δ
...FluentSQLiteDriver/FluentSQLiteConfiguration.swift	77.77% <100.00%> (ø)
...ources/FluentSQLiteDriver/FluentSQLiteDriver.swift	66.66% <ø> (ø)
...s/FluentSQLiteDriver/SQLiteConverterDelegate.swift	100.00% <100.00%> (ø)
...ources/FluentSQLiteDriver/SQLiteRow+Database.swift	63.63% <ø> (ø)
...rces/FluentSQLiteDriver/FluentSQLiteDatabase.swift	86.81% <96.29%> (+0.60%)	⬆️
...rces/FluentSQLiteDriver/SQLiteError+Database.swift	95.23% <88.88%> (ø)

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