feat: add form locking mechanism and share `edit` permission

[Chartman123]

• [x] lock form in backend
• [x] add lockedBy and lockedUntil to getForm and getForms
• [x] adjust documentation to reflect changes in form data structure and API behavior.
• [x] allow adding edit permission to shares in frontend (backend already handles it correctly)
• [x] respect locked form state in frontend
• [x] allow form owner to lock form completely
• [x] allow form owner to remove a lock
• [ ] add/adjust tests

What should someone with edit permissions be able to do?

• [x] only the form owner can transfer ownership
• [x] only the form owner can lock a form completely/remove an existing lock
• [ ] edit form:
  • [x] title
  • [x] description
  • [x] submissionMessage
  • [x] expiration
  • [x] show expiration
  • [x] state closed
  • [ ] state archived
  • [x] anonymous answers
  • [x] submit once/multiple
  • [x] allow edit submissions
  • [x] edit access (permitAllUsers, showToAllUsers)
  • [x] link/unlink files
• [ ] delete form
• [x] add/edit/delete questions
• [x] add/edit/delete options
• [ ] add/edit/delete shares

[hamza221]

#936

[codecov[bot]]

Codecov Report

:x: Patch coverage is 31.16279% with 148 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 44.12%. Comparing base (3adb419) to head (aa8eca7). :warning: Report is 95 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2737      +/-   ##
============================================
- Coverage     45.48%   44.12%   -1.37%     
- Complexity      987     1022      +35     
============================================
  Files            79       80       +1     
  Lines          3586     3683      +97     
============================================
- Hits           1631     1625       -6     
- Misses         1955     2058     +103     

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[Chartman123]

@susnux @hamza221 should be ready for a first review :)