Suggest using the `#:with` pattern directive instead of `with-syntax`

In uses of syntax-parse, clauses whose tail expression is a with-syntax form can be replaced with #:with pattern directives. For example, given this expression:

(syntax-parse stx
  [foo:id
   (with-syntax ([bar #'(+ 1 2 3)])
     #'(foo bar)])

Resyntax ought to suggest simplifying it to this:

(syntax-parse stx
  [foo:id
   #:with bar #'(+ 1 2 3)
   #'(foo bar)])

This can open up the door for related simplifications of syntax-parse such as #142.

Start by locating Resyntax's handling of syntax-parse clauses and any existing tests for related refactorings. Compare the with-syntax example with the requested #:with pattern directive, and review issue #142 for related simplifications. Done means the transformation is suggested correctly without changing the resulting syntax.