## Changes
1. Changed `FindResourceByConfigKey` to return schema resources
2. Implemented the `Exists` method for schema resources
## Why
This PR adds support for schema resources in deployment operations,
enabling users to:
- Bind schemas using `databricks bundle deployment bind <myschema_key>
<schema_full_name>`
- Unbind schemas using `databricks bundle deployment unbind
<myschema_key>`
Where:
- `myschema_key` is a resource key defined in the bundle's .yml file
- `schema_full_name` references an existing schema in the Databricks
workspace
These capabilities allow for more flexible resource management of
schemas within bundles.
## Tests
Added a new integration test that tests bind and unbind methods together
with bundle deployment and destruction.
c0f5436a28