Added lenient command line option

[mildm8nnered]

WIP

Addresses #5779

[SwiftLintBot]

	1 Warning
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

	17 Messages
📖	Linting Aerial with this PR took 0.92s vs 0.93s on main (1% faster)
📖	Linting Alamofire with this PR took 1.27s vs 1.27s on main (0% slower)
📖	Linting Brave with this PR took 7.45s vs 7.43s on main (0% slower)
📖	Linting DuckDuckGo with this PR took 5.08s vs 5.08s on main (0% slower)
📖	Linting Firefox with this PR took 11.08s vs 11.07s on main (0% slower)
📖	Linting Kickstarter with this PR took 10.07s vs 10.05s on main (0% slower)
📖	Linting Moya with this PR took 0.54s vs 0.53s on main (1% slower)
📖	Linting NetNewsWire with this PR took 2.55s vs 2.55s on main (0% slower)
📖	Linting Nimble with this PR took 0.78s vs 0.77s on main (1% slower)
📖	Linting PocketCasts with this PR took 8.63s vs 8.66s on main (0% faster)
📖	Linting Quick with this PR took 0.46s vs 0.44s on main (4% slower)
📖	Linting Realm with this PR took 4.69s vs 4.68s on main (0% slower)
📖	Linting Sourcery with this PR took 2.36s vs 2.35s on main (0% slower)
📖	Linting Swift with this PR took 4.6s vs 4.58s on main (0% slower)
📖	Linting VLC with this PR took 1.26s vs 1.25s on main (0% slower)
📖	Linting Wire with this PR took 18.26s vs 18.15s on main (0% slower)
📖	Linting WordPress with this PR took 11.82s vs 11.81s on main (0% slower)

Here's an example of your CHANGELOG entry:

* Added `lenient` command line option.  
  [mildm8nnered](https://github.com/mildm8nnered)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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