This PR adds the databricks store and the generated geometries extension

Checklist

[ ] I have read the contribution guidelines.
[ ] I have sent a Contribution Licence Agreement (not required for small changes, e.g., fixing typos in documentation).
[ ] First PR targets the main branch (backports managed later; ignore for branch specific issues).
[ ] All the build checks are green (see automated QA checks).

For core and extension modules:

[ ] New unit tests have been added covering the changes.
[ ] Documentation has been updated (if change is visible to end users).
[ ] The REST API docs have been updated (when changing configuration objects or the REST controllers).
[ ] There is an issue in the GeoServer Jira (except for changes that do not affect administrators or end users in any way).
[ ] Commit message(s) must be in the form [GEOS-XYZWV] Title of the Jira ticket.
[ ] Bug fixes and small new features are presented as a single commit.
[ ] Each commit has a single objective (if there are multiple commits, each has a separate JIRA ticket describing its goal).

geosolutions-it / geoserver