feat(operator): New RESTPATH operator support

[jptosso]

Add support for @restpath operator

@respath takes a path pattern as a parameter, it processes the received URL and assigns variables to ARGS_PATH, ARGS_NAMES, and ARGS.

For example:

SecRule REQUEST_URI "@restpath /path/{some_id}" "…..chain"
    SecRule ARGS_PATH:some_id "!@eq %{user:session_id}" "deny"

The previous example will expect some_id to be the same as user:session_id.

This feature is a gamechanger for Coraza API security and it will allow much easier syntax for complex nested endpoints.