Add service endpoint to provide hook meta data for UI #47588
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Based on PoC in #41656 this PR adds a service endpoint to service to describe hook meta data such that the UI can be rendered. It is based on the information provided in Airflow 2.0 and allows field hiding, re-labelling and placeholder texts for common fields. Also it provides extra fields which are persisted as JSON. The provided extra fields are compatible with the param struct model from the DAG details such that the FlexibleForm rendering can be re-used as component.
FYI @shubhamraj-git as you might want to start adding UI on it?
relates: #47502