Add warning callback on source freshness

[pankajastro]

closes: #914

This PR introduced on_warning_callback for dbt source freshness command i.e on operator DbtSourceLocalOperator.

Example DAG

source_rendering_dag = DbtDag(
    # dbt/cosmos-specific parameters
    project_config=ProjectConfig(
        DBT_ROOT_PATH / "jaffle_shop",
    ),
    profile_config=profile_config,
    operator_args={
        "install_deps": True,  # install any necessary dependencies before running any dbt command
        "full_refresh": True,  # used only in dbt commands that support this flag
    },
    render_config=RenderConfig(source_rendering_behavior=SourceRenderingBehavior.ALL),
    # normal dag parameters
    schedule_interval="@daily",
    start_date=datetime(2024, 1, 1),
    catchup=False,
    dag_id="source_rendering_dag",
    default_args={"retries": 2},
    on_warning_callback=lambda context: print(context),
)

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Latest commit:	8d7ad66
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (0e826b1) to head (8d7ad66).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1400      +/-   ##
==========================================
+ Coverage   96.48%   96.50%   +0.02%     
==========================================
  Files          69       69              
  Lines        4149     4177      +28     
==========================================
+ Hits         4003     4031      +28     
  Misses        146      146              

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[pankajkoti]

The PR looks good to me. Have a couple of minor comments inline. Is something more to be added to the PR? The description mentions docs to be added. Are we going to add it to the same PR or later?