Add support for (de)serializing swh-model in RPC calls.
This allows running the validating proxy on the client side instead of the server side.
Test Plan
Tests depend on swh-core!129 (closed).
Migrated from D2676 (view on Phabricator)
Staging instance, all changes can be removed at any time
This allows running the validating proxy on the client side instead of the server side.
Tests depend on swh-core!129 (closed).
Migrated from D2676 (view on Phabricator)