[Phase 8] Model Revision & Deployment Policy API

Split from [BA-4752 [Phase 6]|https://lablup.atlassian.net/browse/BA-4752] to reduce scope. Contains Model Revision and Deployment Policy API/SDK/CLI work.

## Scope

### Model Revision API

- BA-4631: GQL mutations for add_model_revision
- BA-4670: Remove create_model_revision mutation (completed)
- BA-4690: REST API for add_model_revision (completed)
- BA-4691: SDK/CLI for add_model_revision (completed)

### Deployment Policy API

- BA-4632: GQL mutations for create/update deployment_policy
- BA-4692: REST API for deployment_policy (completed)
- BA-4693: CLI for deployment_policy (completed)
- BA-4872: Search deployment policies endpoint (Not Planned)

JIRA Issue: BA-5291