chore: add API v3

[Chartman123]

This closes #2079

Forms

• [x] Get forms GET /forms[?type=owned]
• [x] Get shared forms GET /forms?type=shared
• [x] New form POST /forms
• [x] Get form GET /forms/:form-id:
• [x] Get partial form GET /forms/0?hash=:form-hash:
• [x] Clone form POST /forms?fromId=:form-id:
• [x] Update form PATCH /forms/:form-id:
• [x] Transfer ownership - (just use patch/update)
• [x] Delete form DELETE /forms/:form-id:
• [x] Link file to form - (just use patch/update)
• [x] Unlink file - (just use patch/update)

Questions

• [x] Get questions GET /forms/:form-id:/questions
• [x] New question POST /forms/:form-id:/questions
• [x] Get question GET /forms/:form-id:/questions/:question-id:
• [x] Update question PATCH /forms/:form-id:/questions/:question-id:
• [x] Reorder questions PATCH /forms/:form-id:/questions
• [x] Clone question POST /forms/:form-id:/questions?fromId=:question-id:
• [x] Delete question DELETE /forms/:form-id:/questions/:question-id:

Options

• [ ] Get options GET /forms/:form-id:/questions/:question-id:/options (currently not used)
• [x] New option(s) POST /forms/:form-id:/questions/:question-id:/options
• [ ] Get option GET /forms/:form-id:/questions/:question-id:/options/:option-id: (currently not used)
• [x] Update option PATCH /forms/:form-id:/questions/:question-id:/options/:option-id:
• [ ] Reorder options PATCH /forms/:form-id:/questions/:question-id:/options (currently not used)
• [ ] Clone option POST /forms/:form-id:/questions/:question-id:/options?fromId=:option-id: (currently not used)
• [x] Delete option DELETE /forms/:form-id:/questions/:question-id:/options/:option-id:

Sharing

• [ ] Get user's shares GET /shares (currently not used)
• [ ] Get shares of a form GET /forms/:form-id:/shares (currently not used)
• [x] New share POST /forms/:form-id:/shares
• [ ] Get share GET /forms/:form-id:/shares/:share-id: (currently not used)
• [x] Update share PATCH /forms/:form-id:/shares/:share-id:
• [x] Delete share DELETE /forms/:form-id:/shares/:id:

Submissions

• [x] Get submissions GET /forms/:form-id:/submissions
• [x] Download submissions GET /forms/:form-id:/submissions?fileFormat=:file-format:
• [x] New submission POST /forms/:form-id:/submissions
• [x] Delete submissions DELETE /forms/:form-id:/submissions
• [ ] Get submission GET /forms/:form-id:/submissions/:submission-id: (currently not used)
• [ ] Update submission PATCH /forms/:form-id:/submissions/:submission-id: (currently not used)
• [x] Delete submission DELETE /forms/:form-id:/submissions/:submission-id:
• [x] Export submissions to cloud POST /forms/:form-id:/submissions/export
• [x] Upload files POST /forms/:form-id:/submissions/files/:question-id:

Documentation

• [x] Adjust documentation and mark old API v2 as deprecated

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 30.63512% with 557 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@2faabe0). Learn more about missing BASE report. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2222 +/- ## ======================================= Coverage ? 36.20% Complexity ? 1004 ======================================= Files ? 68 Lines ? 3798 Branches ? 0 ======================================= Hits ? 1375 Misses ? 2423 Partials ? 0 ```