feat: add fields Submitter / CoMaintainers to metadata-archives
This adds "Submitter" and "CoMaintainers" to the metadata archives
Submitter -> packages-meta-v1.json.gz & packages-meta-ext-v1.json.gz
CoMaintainers -> packages-meta-ext-v1.json.gz
Preparation to get #400 (closed) and #395 (closed) exposed via /rpc
Signed-off-by: moson-mo mo-son@mailbox.org