* list/emacs-lisp/edebug.el: Don't overload `edebug-form-spec`

* list/emacs-lisp/edebug.el: Don't overload `edebug-form-spec`

The `edebug-form-spec` symbol property was used to store two different things:
the handlers for spec elements like `body` and the handlers for
spec operators like `&or`.  But these two sets use different calling
conventions, so they're fundamentally incompatible.

So, move the handlers to spec operators to the new property
`edebug--spec-op-function`.  This unbreaks Edebugging of:

    (cl-flet ((f (&rest x) x)) 3)

* lisp/emacs-lisp/edebug.el <toplevel>: Split the alist of built in
spec elements into normal spec element and spec ops.
(edebug--get-spec-op): New function.
(edebug-match-specs): Use it.
(edebug-match-:name): Rename from `edebug-match-colon-name`.