kedro-airflow: implement @task and @dag decorators in DAG, generated by plugin

[DimedS]

Description

Following the investigation done in #25:

We will implement the @task and @dag decorators from the TaskFlow API into the DAG generated by the kedro-airflow plugin from the Kedro project. This implementation will:

1. Make the DAG code shorter and cleaner.
2. Allow us to move away from using KedroOperator, simplifying the user experience and addressing Kedro plugins issue Introduce KedroOperator for Airflow #482.
3. Demonstrate our commitment to keeping up with current best practices and open the way for potentially more extensive use of TaskFlow in the future.

Possible Implementation

Modify airflow_dag_template.j2 accordingly

[noklam]

This seems contradicts to the conclusion of #25?

[ankatiyar]

@noklam We discussed a bit more and decided to adopt certain aspects of the TaskFlow Api for now.