Feat/507 add citation field

[seyfeb]

Topic and Scope

Adds support for the citation property (https://schema.org/citation) to recipe editor and viewer.

Example with citation: "Peter Pan"

Closes #507

Concerns/issues

Possible UI/UX option: Make citation text an anchor if URL property is set. This would make for a cleaner look (no URL is shown). Caveats: What if URL is set, but no citation field?

Formal requirements

There are some formal requirements that should be satisfied. Please mark those by checking the corresponding box.

• [x] I did check that the app can still be opened and does not throw any browser logs
• [x] I created tests for newly added PHP code (check this if no PHP changes were made)
• [x] I updated the OpenAPI specs and added an entry to the API changelog (check if API was not modified)
• [x] I notified the matrix channel if I introduced an API change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.07%. Comparing base (116d92f) to head (2a38427). Report is 617 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2023   +/-   ##
=======================================
  Coverage   80.07%   80.07%           
=======================================
  Files          92       92           
  Lines        2650     2650           
=======================================
  Hits         2122     2122           
  Misses        528      528           

Flag	Coverage Δ
integration	21.43% <ø> (ø)
migration	5.69% <ø> (ø)
unittests	57.09% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[github-actions[bot]]

Test Results

   12 files    572 suites   1m 30s :stopwatch:   552 tests   552 :white_check_mark: 0 :zzz: 0 :x: 2 208 runs  2 207 :white_check_mark: 1 :zzz: 0 :x:

Results for commit 2a384277.

:recycle: This comment has been updated with latest results.