Allow multiple -only_rule command line arguments

[mildm8nnered]

WIP

Waiting on #5773 - this contains those changes as well.

[SwiftLintBot]

	17 Messages
📖	Linting Aerial with this PR took 0.91s vs 0.92s on main (1% faster)
📖	Linting Alamofire with this PR took 1.26s vs 1.27s on main (0% faster)
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📖	Linting Swift with this PR took 4.47s vs 4.48s on main (0% faster)
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📖	Linting Wire with this PR took 17.39s vs 17.35s on main (0% slower)
📖	Linting WordPress with this PR took 11.47s vs 11.45s on main (0% slower)

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