wireproto: function for testing if wire protocol command is available Currently, we perform simple membership testing for whether a wire command is available. In the future, not all wire protocol commands will be available on all transports. For example, a legacy transport may not support newer commands. In preparation of this, teach the protocol handlers to call into a function to determine if a wire protocol command is available. That function currently does membership testing like before, so behavior should be identical. In the case of the HTTP server, behavior is a bit wonkier. "cmd" is used by both the wire protocol and hgweb. We do want the protocol handler to handle requests for all commands that look like wire protocol commands, even if they aren't available. Otherwise, the fallback to hgweb would only confuse automated clients and make it easier for hgweb to accidentally implement a "cmd" that is identical to wire protocol commands (since they aren't centrally registered). Differential Revision: https://phab.mercurial-scm.org/D1999

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