amp-bind-macro: Improve error message

Currently the error message for recursive/cyclic macros is something like `foo is not a supported function` *at invocation time* even though `foo()` may well exist. It'd be better to have a more precise error message *at parse time*.

/cc @josh313

Start by locating the amp-bind-macro parsing and recursive/cyclic macro error handling, then compare where the current invocation-time message is produced with the parse-time path. Done means recursive or cyclic macros report a precise error during parsing instead of claiming an existing function is unsupported.

Written by the indexing model from the issue text.