feat: add form locking mechanism and share edit permission

[Chartman123]

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

What should someone with edit permissions be able to do?

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

[hamza221]

#936

[codecov]

Codecov Report

❌ Patch coverage is 31.16279% with 148 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.12%. Comparing base (3adb419) to head (aa8eca7).
⚠️ 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 :)

[susnux]

Generally makes sense and looks good!
I would personally have it inverted meaning using lockedSince instead of lockedUntil as then we can change the locking time easier on updates.
But makes not really a difference.