Include extra metadata for target repositories

[kdp-cloud]

ENA expects more metadata about their 'study' model than is included in the ISA JSON. These fields include:

• study type: Controlled vocabulary
• other study type: Free text IF study type is 'other'. Otherwise, should be empty.
• study title
• ...

Other target repositories might require even more.

This might require some broader discussion on how to include this information in the ISA JSON.