This commit abstracts the database operations to use the generic
`sqlx::Executor` trait instead of a concrete `&sqlx::PgPool`.
This change allows all generated methods (find, create, update,
delete, and relationships) to be executed within a
`sqlx::Transaction`, in addition to a connection pool. This is a
crucial feature for ensuring atomic operations and data consistency.
The public-facing traits `Georm` and `Defaultable` have been updated
to require `sqlx::Executor`, and the documentation has been updated to
reflect this new capability.
Adds an example demonstrating user, comment, and follower relationship
including:
- User management with profiles
- Comments (not really useful, just for showcasing)
- Follower/follozing relationships
- Ineractive CLI interface with CRUD operations
- Database migrations for the example schema
