Add ability to set new activity types through the UI

[djaiss]

This is the second part of #1556.

This PR adds the ability to define new activity types and activity type categories through the UI. It also fixes one or two bugs in the API for these new methods (introduced in #1556).

This will address #282

Remaining core tasks:

• Add success/error messages
• Highlight rows when mouse hover
• Make sure API doc is still accurate
• This feature should be for paid accounts on .com

Checklist

Before submitting the PR

• Screenshots are included if the PR changes the UI.

Code-related tasks

• Tests added for this feature/bug.
• Impact on the seeders.
• Impact on the API.

If the code changes the SQL schema

• Impact on account export.
• Impact on importing data with vCard and .csv files.
• Impact on account reset and deletion.

Other tasks

• CHANGELOG entry added, if necessary, under UNRELEASED.
• If it's relevant and worth mentioning, create a changelog entry for this change. The changelog entry will appear inside the UI for all users to see. To know if your change is worth the creation of a changelog entry, read the documentation.
• Indicate [wip] in the title of the PR it is is not final yet. Remove [wip] when ready. Otherwise the PR will be considered complete and rejected if it's not working.

[djaiss]

@asbiin is this error in CircleCI linked to your refactor on 2FA?

[djaiss]

@asbiin alright there is definitely a problem I think with the 2FA test.

[github-actions]

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