[AIP-94] airflowctl tasks: add states-for-dag-run command

[bugraoz93]

Body

Summary

Add airflowctl tasks states-for-dag-run to ctl/commands/task_command.py.
Custom command in ctl/commands/ — wired via cli_config.py.

Implementation

• Add a task_states_for_dag_run function to ctl/commands/task_command.py.
• Call GET /api/v2/dags/{dag_id}/dagRuns/{run_id}/taskInstances directly.
• Output via AirflowConsole().print_as(data=[{"task_id": ti.task_id, "state": ti.state} for ti in tis], output=args.output).
• Wire as airflowctl tasks states-for-dag-run --dag-id <id> --dag-run-id <run_id>
  in cli_config.py.

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.