Small cleanups in RPC code, e.g. to support null arguments.

- Add support for null pointer arguments in RPCs for get_digest_algorithm_id
  and get_public_key. This is years overdue, and would have obviated the need
  for get_public_key_len as a separate RPC.

- Refactor pkey_local_get_public_key_len in terms of pkey_local_get_public_key.

- Add more parameter sanity checks to rpc_api.c.

- Add a len_max parameter to hal_xdr_decode_variable_opaque, rather than
  having len be an in/out parameter. This brings xdr slightly more in line
  with the rest of the code base (again after literal years), and slightly
  simplifies several calls in rpc_client.c.

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