Allow to set configuration elements as deprecated

[SimplyDanny]

Automatically print an appropriate warning to the console.

[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 0.8s vs 0.83s on main (3% faster)
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📖	Linting Brave with this PR took 6.47s vs 6.57s on main (1% faster)
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📖	Linting NetNewsWire with this PR took 2.41s vs 2.44s on main (1% faster)
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📖	Linting Quick with this PR took 0.32s vs 0.33s on main (3% faster)
📖	Linting Realm with this PR took 4.01s vs 4.0s on main (0% slower)
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📖	Linting Swift with this PR took 3.96s vs 3.93s on main (0% slower)
📖	Linting VLC with this PR took 1.12s vs 1.11s on main (0% slower)
📖	Linting Wire with this PR took 14.27s vs 14.16s on main (0% slower)
📖	Linting WordPress with this PR took 9.56s vs 9.57s on main (0% faster)

Here's an example of your CHANGELOG entry:

* Allow to set configuration elements as deprecated.  
  [SimplyDanny](https://github.com/SimplyDanny)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

note: There are two invisible spaces after the entry's text.

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