Airflow Task State Store (AIP-103)

Airflow 3.3 ships two key/value stores and a crash-safety mixin for operators that submit external jobs.

Requires Airflow 3.3+. Check first:

af config version

If the version is below 3.3, tell the user these features are not yet available and link them to the AIP-103 tracking issue instead.

Section 1 — Pick the right primitive