Translate KongCustomEntity CRs to Kong entities in declarative configuration

[randmonkey]

Is there an existing issue for this?

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Does this enhancement require public documentation?

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

Problem Statement

Split from #4556.
To support custom entities specified by KongCustomEntity CRs in DBLess mode, we need to translate the CRs and attach them to correct entities if they are needed to attach.

Proposed Solution

• Translate KongCustomEntity CRs to lists of entities in declarative configuration. Entities having the same type are in the same list.
• Find out the attached entity (service/route/consumer/...) by its parent KongPlugin or KongClusterPlugin and add foreign keys to the fields

Additional information

No response

Acceptance Criteria

• Fields of KongCustomEntity CRs are correctly translated in declarative config
• For entities attached to other entities, the parent is correctly found and their keys are filled in fields of translated Kong custom entities