[Depends on Airflow 2 support on Providers] Update all providers packages for server-client separation

Provider packages need to be updated to depend on appropriate components (SDK for operators, server for executors, etc.). ## Tasks - [ ] Update provider dependencies: - Operators: depend on airflow-sdk - Executors: depend on airflow-server (maybe separate executors into separate package) - Secrets backends: depend on airflow-sdk - Hooks: depend on airflow-sdk - [ ] Update provider imports: - Remove `airflow-core` imports - Use `airflow-sdk` or `airflow-protocols`/`airflow-common`