Databricks: add SQL endpoint operators

### Description

Operators to manipulate Databricks SQL endpoints.

### Use case/motivation

Support conveniently managing the lifecycle of Databricks SQL endpoints. This likely entails building one or more operators which talk to the [endpoints API](https://docs.databricks.com/sql/api/sql-endpoints.html) and support:

* Creating endpoints
* Deleting endpoints
* Starting endpoints
* Stopping endpoints

These operations map cleanly to individual API calls.

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

Begin with the linked Databricks SQL endpoints API and map its lifecycle calls to Airflow's operator conventions. Identify the existing Databricks integration entry points and relevant operator tests before deciding whether one or several operators fit. Done means endpoint creation, deletion, starting, and stopping are supported and covered by tests.

Written by the indexing model from the issue text.