Standardize formatting

[dfed]

Use SwiftFormat and an editorconfig file to standardize formatting in the repo. Once this PR lands, I'll ignore this commit in blame via a .git-blame-ignore-revs file.

[codecov]

Codecov Report

Attention: Patch coverage is 99.02344% with 5 lines in your changes missing coverage. Please review.

Project coverage is 99.02%. Comparing base (11932bc) to head (a7fc32f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/CacheAdvance/CacheReader.swift	93.82%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   99.01%   99.02%           
=======================================
  Files           8        8           
  Lines         507      512    +5     
=======================================
+ Hits          502      507    +5     
  Misses          5        5           

Files with missing lines	Coverage Δ
Sources/CADCacheAdvance/CADCacheAdvance.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/BigEndianHostSwappable.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/BoolExtensions.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/CacheAdvance.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/CacheHeaderHandle.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/EncodableMessage.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/FileHeader.swift	100.00% <100.00%> (ø)
Sources/CacheAdvance/CacheReader.swift	93.82% <93.82%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.