Create rule for flagging query parameters in paths as invalid

[rossmcdonald]

While not technically in violation of the OpenAPI specification, including a query parameter in a path should be flagged as an error in Spectral:

A path has specific meaning in HTTP as a part of a URL that comes after the host name and before the query string or fragment. A "path item" key must be only a path, it cannot have a query string or a fragment.

For example, the following when defined as a path in an OAI specification should be flagged as an error:

/auth/user?token={token}