Create DAG using stactools to build and publish STAC items

[ividito]

Using stactools can give data providers another way to describe ingestion steps, which supports our goal of making ingestion more user-configurable. Stactools packages can also be re-used in other contexts, which makes it easier for advanced users to bring VEDA data into their own STAC catalogs.

A similar approach has been used in ASDI, but for VEDA we would need to adapt these pipelines to use Airflow.

Related: https://github.com/NASA-IMPACT/veda-architecture/issues/283