idea: make sure the model hub update are reviewed before going live

[louis-jan]

Problem Statement

Currently, it's automatically merge which is very scary.

1. Loop model hub maintainer to review the PR
2. Add bot reviewer to save the review effort
3. Add tests

Feature Idea

.

[Minh141120]

• Remove auto merge PR, loop human review pr in the process ✅
• Add bot reviewer to save human effort ✅
• Todo: Add json validation script @qnixsynapse 🚧

[qnixsynapse]

json can be validated using jsonschema: https://json-schema.org/