Stdlib::Http::Method: Add new type for http methods

This PR creates new new resources:

• Stdlib::Http::Method for validating http methods
• Stdlib::Http::Status This is just a copy of Stdlib::Httpstatus
• make Stdlib::Httpstatus and alias to Stdlib::Http::Status

Ideally we would deprecate Stdlib::Httpstatus in favour of
Stdlib::Http::Status