mcp-rpc-cli: send user_id in rpc calls
mcp-rpc-cli: send user_id in rpc calls

Hardcoded to "1" for now

Connects to https://github.com/archivematica/Issues/issues/728
Related to https://github.com/archivematica/Issues/issues/529

artefactual/archivematica-devtools,artefactual/archivematica-devtools