test: Check RPC argument mapping

Parse the dispatch tables from the server implementation files,
and the conversion table from the client.

Perform the following consistency checks:

- Arguments defined in conversion table, must be present in dispatch
  table. If not, it was probably forgotten to add them to the
  dispatch table, and they will not work.

- Arguments defined in conversion table must have the same names as
  in the dispatch table. If not, they will not work.

- All aliases for an argument must either be present in the
  conversion table, or not. Anything in between means an oversight
  and some aliases won't work.

Any of these results in an error.

It also performs a consistency check to see if the same
named argument is sometimes converted, and sometimes not. E.g.
one RPC call might have a 'verbose' argument that is converted,
another RPC call might have one that is not converted. This is not
necessarily wrong, but points at a possible error (as well as
makes the API harder to memorize) - so it is emitted as a warning
(could upgrade this to error).

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