Add new resolver for marking quizzes illegible and update quiz list to allow filtering on this

[danielemery]

Introduces the ideas of "Quiz Notes". At the moment this includes only marking quizzes as illegible but the same table will be used later to request corrects etc.

Adds a new resolver markQuizIllegible which adds a note against the given quiz. Also tracks the user that added the note and the time they added it.

Adds a new filter when listing quizzes excludeIllegible which either allows you to exclude quizzes that you have marked illegible or quizzes that anyone has marked illegible.

Currently does not surface the quiz notes anywhere but will likely later be surfaced as part of the quiz details resolver.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 31.94%. Comparing base (5314cf1) to head (222c4fb).

Files	Patch %	Lines
src/quiz/quiz.persistence.ts	0.00%	8 Missing and 1 partial ⚠️
src/quiz/quiz.gql.ts	0.00%	4 Missing ⚠️
src/quiz/quiz.service.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   32.92%   31.94%   -0.98%     
==========================================
  Files          22       22              
  Lines         489      504      +15     
  Branches       75       78       +3     
==========================================
  Hits          161      161              
- Misses        318      332      +14     
- Partials       10       11       +1     

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