Make care single source of truth for asset config on middleware

[sainak]

Proposed Changes

• add middleware level auth
• cache middleware openid keys
• cleanup middleware auth
• add route to fetch asset configs for middlewares
• add handlers to push config updates to middlewares
• allow middleware asset to access related assetbeds

Associated Issue

• required for https://github.com/coronasafe/teleicu_middleware/issues/118

Merge Checklist

• [ ] Tests added/fixed
• [ ] Update docs in /docs
• [ ] Linting Complete
• [ ] Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins