Spike: Konnect managed entities design

[lahabana]

Problem Statement

POC and design for Konnect managed entities (#370).

Proposed Solution

This what this issue is about.

Additional Information

• Discovery doc

Acceptance Criteria

• [x] A POC is created to understand what needs to be done
  • [x] PoC has been implemented (https://github.com/Kong/gateway-operator/tree/konnect-entities-poc) and demoed.
• [x] An engineering brief is written and approved
  • [x] Design doc has been produced https://docs.google.com/document/d/1TxW2ovqPRm-w1td1e_V0CyaET4lpiEBCJ7hiYMZJqng/edit
• [x] A plan for migrating KGO repo to multiple API groups as well as migrating KIC's CRDs to a separate repo has been prepared https://docs.google.com/document/d/1miPzsLOoTLzZFU0v8YLwE5AsKfzI-2W93Ku7j3T6LPw/edit#heading=h.6m8104r2naum
• [ ] #370 is populated with a set of tasks required for implementation
• [ ] This plan is reviewed and approved by the team

[pmalek]

• Design doc is available at https://docs.google.com/document/d/1TxW2ovqPRm-w1td1e_V0CyaET4lpiEBCJ7hiYMZJqng/edit
• Migration plan for CRDs available at https://docs.google.com/document/d/1miPzsLOoTLzZFU0v8YLwE5AsKfzI-2W93Ku7j3T6LPw/edit#heading=h.6m8104r2naum

Currently both under review