Add http method into session.MatchContext

[luozhihua]

When using authorizer: keto_engine_acp_ory, we need to configure required_action, and for a restful style api, in most cases the method represents the meaning of action, so if put http methods in session.MatchContext , It will be more convenient to use keto_engine_acp_ory, remote and remote_json authorizer.

In fact, in oathkeeper access rules, methods are used as a condition of match, so it should be put into session.MatchContext

[aeneasr]

Yes, adding them to MatchContext makes sense to me!