IOS2-1480 Add SwiftLint plugin & config

[capnsolo]

• add plugin & config
• set minimum OS version to 14.0
• fix violations

Notes

• the first time you build with the plugin, Xcode will prompt you and you'll have to "Trust & Enable" the plugin before it can run
• the plugin didn't work for me at first; changing the name of my Xcode app back to "Xcode" fixed it (I had previously named it "Xcode 15.1 beta" when I had multiple versions installed)
• most of the changes are cleaning up trailing whitespace; I recommend hiding whitespace in the Github editor or looking at the commits individually
• the output in the build log is different than in the apps:

issues found:

no issues:

[yangchen83]

LGTM