* [SwiftSyntax] Add SyntaxRewriter.visitAny(_:)
This function, when overridden, allows Syntax rewriters to perform custom dynamic visitation behavior. If a user wanted to, say, store a series of transformations accessible by metatype, they can override visitAny and do their own runtime dispatch.
If a non-nil result is returned from visitAny, the original specialized visitors are skipped.
