Committee csv file: add new column

current behavior
Currently the committee export lacks in easy reference possibilties for reimport of for example lost data or to add something new. The referencing is done by committee names. If the names are changed, the referencing is quite hard, because the user neds to know the new (changed) name. A much easier and clear reference value would be pleasent. - A good value would be the committee id.

Additionally the csv lacks in information about external_id of a committee, which is relevant for SAML configurations.

Also the csv file lacks in information about the parent relations of a committee, which is needed to spot relations between committees.

Wanted behavior
The aim of the issue is, to enable a clear reference possibility of committees in one instance and to add more information about the committee itself and it's relations ot other committees.

• new column 'committee_id' at first position
• new column 'external_id' at last position
• new columns 'parent_name' and 'parent_id' after the column 'forward_to_committees' (or possibly 'forward_to_committee_ids' in the future)

Please take care that the last point and it column refers to the issue OpenSlides/openslides-client#6465. With this issue a new column 'forward_to_committees_ids' should be integrated.

The issue does not name files or tests; start by locating the committee CSV export entry point and its existing column-order tests. Verify the requested committee_id, external_id, parent_name, and parent_id columns and their positions, while checking compatibility with OpenSlides/openslides-client#6465. Done means the export contains the specified identifiers and parent relationship data.