Convert SwiftLint custom rules to AnyLint checks

[Jeehut]

Such a converter could transform this:

class_name_suffix_collection_view_controller:
    included: ".*\.swift"
    regex: 'class +\w+(?<!CollectionViewController) *(?:<[^>]+>)? *: +\w+CollectionViewController'
    name: "Class Name Suffix View Controller"
    message: "All `CollectionViewController` subclasses should end on `CollectionViewController`."
    severity: warning

to something like this:

// MARK: ClassNameSuffixCollectionViewController
    try Lint.checkFileContents(
        checkInfo: "ClassNameSuffixCollectionViewController: All `CollectionViewController` subclasses should end on `CollectionViewController`.",
        regex: #"class +\w+(?<!CollectionViewController) *(?:<[^>]+>)? *: +\w+CollectionViewController"#,
        matchingExamples: [], // TODO: [2020-04-21] not yet implemented
        nonMatchingExamples: [], // TODO: [2020-04-21] not yet implemented
        includeFilters: #".*\.swift"#
    )

[Jeehut]

Consider showing a warning before doing the conversion with a hint that all SwiftLint rules that only work on specific kinds of Swift structures (e.g. only methods) might not work as expected. Consider adding a warning comment in the converted AnyLint configuration file. Also warn the user to make sure they have committed their code before running the new configuration file.