Add OdooRelease model and import/parsing functionality

This pull request introduces the following changes:

1. Adds a new model called OdooRelease, which represents OCB releases.

   • Each OdooRelease is related to a single OdooVersion.
   • Includes a list of all OdooInstance objects that have the corresponding OdooRelease.

2. Updates the odoo.instance model:

   • Adds a new field called branch to track the deployed branch.
   • Implements a method to import and parse a YAML file from the inventory URL, and extract the odoo_role_odoo_release key to fill in the OdooRelease field.

3. Updates the odoo.version model:

   • Track linked odoo_release

4. Creates views, menus, actions, and searches for the new OdooRelease model.

5. Adds a button in the odoo.instance form view to manually import and parse the YAML file and fill in the odoo_release_id field.