This commit introduces database schema changes to extend the role and
permission management capabilities of Solidus.
These changes are derived from the solidus_user_roles gem and are
designed to provide more granular control over user roles and permissions.

Changes include:
  * Create Spree Permission Sets:
      Introduced a new Spree::PermissionSet table in the database.
      This table will store sets of permissions, each with a name and set
      identifier, that can be assigned to user roles.

  * Create Spree Roles Permissions:
      Introduced a new Spree::RolePermission table in the database.
      This table will store the associations between roles and permission sets.
      It includes foreign key references to the Spree::Role and
      Spree::PermissionSet tables.

This commit expands the functionality of the `Spree::Role` model to provide more
granular and efficient control over user roles and permissions.

  * Spree::RolePermission
  * Spree::Role enhancements
  * Spree::PermissionSet

These enhancements are a part of our broader initiative to improve the
flexibility and extensibility of role and permission management in Solidus,
adapting functionality from the `solidus_user_roles` gem.

This commit introduces a simple rake task that imports the
Permission Sets to the DB, then iterates over the
defined permissions on AppConfiguration to create the
RolePermissions.