wireproto: use decorator for the changegroupsubset command

wireproto: use decorator for the changegroup command

wireproto: use decorator for the capabilities command

wireproto: use decorator for the branches command

wireproto: use decorator for the branchmap command

wireproto: use decorator for the between command

wireproto: use decorator for the batch command

wireproto: add decorator for wire protocol command Move move in the same direction we took for command line commands. each wire protocol function will be decorated with its name and arguments. Beside beside easier to read, this open the road to easily adding more metadata (like security level or return type)

wireproto: drop the _decompress method in favor a new call type We already have multiple call function for multiple return type. The `_decompress` function is only used for http and seems like a layer violation. We drop it in favor of a new call type dedicated to "stream that may be useful to compress".

wireproto: document protocol specific function of wirepeer Those function are explicitly declared and documented now.

wireproto: introduce an abstractserverproto class sshserver and webproto now inherit from an abstractserverproto class. This class is introduced for documentation purpose.

wireproto: document possible return type The wireprotocole command use a small set of class as return value. We document the meaning of each of them. AS my knowledge of wire protocol is fairly shallow, the documentation can probably use improvement. But this is a better than nothing.