Added a new api function create_resource_with_regex

[OmentaElvis]

This function will pass the uri as is to the Resource engine. No additional processing is done to check for query parameters and other path captures. The uri will be saved as a valid regex. It will also extract named captures from the regex and pass it to the Request parameters so that users can still use the original api of:

let server = TestServer::new().unwrap();
let resource = server.create_resource_with_regex("^/(?<group_id>.*)/(?<artifact_id>.*)/maven-metadata.xml$");
resource.status(Status::OK).body("{path.group_id}:{path.artifact_id}");

or

let server = TestServer::new().unwrap();
let resource = server.create_resource_with_regex("^/(?<group_id>.*)/(?<artifact_id>.*)/maven-metadata.xml$");
resource.method(Method::GET).status(Status::OK)
            .body_fn(|param| {
                let group_id = param.path.get("group_id").unwrap();
                let artifact_id = param.path.get("artifact_id").unwrap();

                format!("{group_id}:{artifact_id}")
            });

This will allow for fine grained control of uri therefore allowing extraction of uri segments for further processing of body response.

Did not affect the existing api.