Rename ctx_{get,set}_params to {get,set}_ctx_params

Rename ctx_{get,set}_params to {get,set}_ctx_params

Recently, we added dispatched functions to get parameter descriptions,
and those for operation context parameters ended up being called
something_gettable_ctx_params and something_settable_ctx_params.

The corresponding dispatched functions to actually perform parameter
transfers were previously called something_ctx_get_params and
something_ctx_set_params, which doesn't quite match, so we rename them
to something_get_ctx_params and something_set_ctx_params.

An argument in favor of this name change is English, where you'd
rather say something like "set the context parameters".

This only change the libcrypto <-> provider interface.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9612)