AIP-72: Support DAG parsing context in Task SDK

[kaxil]

closes #45693

Adds support for the Magic Loop: https://airflow.apache.org/docs/apache-airflow/stable/howto/dynamic-dag-generation.html#optimizing-dag-parsing-delays-during-execution with Task SDK

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[ashb]

Looks good, but we likely need a compat import shim for airflow/utils/dag_parsing_context.py -- do we have a place to capture those anywhere.

Also cc @Lee-W @uranusjr Another deprecated import to track in Ruff please.

[kaxil]

Looks good, but we likely need a compat import shim for airflow/utils/dag_parsing_context.py -- do we have a place to capture those anywhere.

Also cc @Lee-W @uranusjr Another deprecated import to track in Ruff please.

Good point, Yeah, #41641

Added newsfragment too

[Lee-W]

ruff PR created astral-sh/ruff#15525