[Connector Builder] POC of YAML -> UI conversion

[lmossman]

What

Do a POC of the logic to convert a YAML manifest into the connector builder UI form state values.

The goal of this is to evaluate how complex or brittle this type of conversion will be, to help inform us about the long-term approach we want to take for the UI state handling.

Acceptance Criteria

Evaluate the approach of converting an arbitrary YAML manifest to builder UI state along the following metrics:

• Complexity of conversion logic
• How much is lost when going from YAML to UI
• How difficult is it to handle unexpected components/types

[lmossman]

POC results:

• There is some complexity in conversion, but it is manageable and worth it to gain the ability to switch between UI and YAML, and have YAML manifests as a single source of truth
• Converting only works for YAMLs that implement behavior that the UI supports -- YAML manifests that are doing anything beyond the UI functionality are rejected
• Draft PR can be found here: [Connector Builder]Add ability to convert from YAML manifest to UI #21142
  • Not all of the conversion functionality has been implemented -- this will be continued after other higher priority issues are completed and the blocking backend issue (Connector builder server endpoint to resolve $refs and $options #21211) is completed