Add Jamendo's audiodownload_allowed field to metadata

[stacimc]

Fixes

Related to #3499 by @stacimc

Description

Starts writing Jamendo's audiodownload_allowed field to the metadata column, so that we can get more information about how many such records there are and which licenses they represent.

Testing Instructions

Run the Jamendo dag locally and ingest at least a few 100 records. Verify in pgcli or by inspecting the generated tsv in minio that the column is being written. If you allow the DAG to ingest a few thousand records you should get some results that have audiodownload_allowed set to False.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

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[AetherUnbound]

LGTM and tested successfully locally with

select meta_data->>'audiodownload_allowed' from audio limit 10;