[Tagging] Import a Taxonomy ("Bare Bones")

[bradenmacdonald]

"As a global staff user (instance-level super user), I can import a taxonomy from the taxonomies list page."

Acceptance Criteria

1. From the taxonomy list page, global staff and org-level admins will see an Import button in the top right.
   
2. Clicking it will open a file dialog that the user can use to select any .json or .csv file. Only .csv or .json files should be selectable.
3. Prompt the user for a name for the new taxonomy.
   
4. Prompt the user for a description for the new taxonomy.
   
5. The taxonomy will then be imported and automatically linked to the org for which the user is an org-level admin. If the user is an admin of multiple orgs, it will be linked to each org. If the user is global staff (instance-level admin) it will not be linked to any orgs; display a link to the django admin so they can edit that linking themselves.
6. Global staff they can change the org linking via the Django admin.
7. If an error occurs, display an alert/toast and put the details in the browser console.
   

Developer Notes

• Implementing any required backend API / REST API is required as part of this story! There is import code on the backend but no REST/upload API.
• See the accept attribute for how to implement # 2, limit selection to .csv or .json files.
• The UX will be significantly improved in [Tagging] Set taxonomy metadata during import #116
• Screenshots above are for convenience - Figma is the most up-to-date source for mockups. The scale of UI elements seen in the screenshots above may be incorrect.

[pomegranited]

@bradenmacdonald once the taxonomy create/import is successful, do we stay on the Taxonomy List page, or redirect to the new Taxonomy's Detail page?

[bradenmacdonald]

once the taxonomy create/import is successful, do we stay on the Taxonomy List page, or redirect to the new Taxonomy's Detail page?

@ali-hugo @jmakowski1123 any preference?

[ali-hugo]

@bradenmacdonald @pomegranited I think the user should stay on the Taxonomy List page.