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).
Backport of core PR10753
The script will be integrated into arcanist in a later diff.