Support custom entities in failure domain

[randmonkey]

Is there an existing issue for this?

• [X] I have searched the existing issues

Does this enhancement require public documentation?

• [X] I have added an Acceptance Criteria item for adding and/or adjusting public documentation (if applicable)

Problem Statement

Custom entities are not supported in failure domains. So they cannot be recovered with cached good config. This may cause stuck in applying configuration to Kong gateway when custom entities have wrong config.

Proposed Solution

• Add custom entities to caches of failure domains
• Generate dependencies of custom entities from their schema

Additional information

Blocked by #6054

Acceptance Criteria

• [ ] Custom entities can be recovered in failure domains.