Replace Orika mapping with MapStruct

[axlewin]

This removes the old Orika converters & automappers and replaces them with MapStruct mappings.

Most of the mappings just define a source & target type and let the MapStruct auto-implementations handle the rest. The DTO <-> DO mappings are named map(source) (or copy(source) if the source & target classes are the same); any other mappings are named according to the target type.

The mappers are split according to the kind of objects they map, but the MainMapper interface is used to provide a mapper object in most cases. For consistency, one of the new mappers is called ContentMapper, hence the existing ContentMapper has been renamed (to ContentSubclassMapper).

There are two new sets of tests: one for Content DO -> DTO mappings and one for QuestionValidationResponse DO -> DTO mappings. These are the only cases where there are lots of subclasses we can easily test at the same time, but we could have case-by-case tests for some/all of the other mappings too.

[codecov]

Codecov Report

❌ Patch coverage is 53.54331% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.94%. Comparing base (09e797d) to head (8f83434).
⚠️ Report is 120 commits behind head on main.

Files with missing lines	Patch %	Lines
...cam/cl/dtg/segue/api/managers/QuestionManager.java	15.38%	11 Missing ⚠️
...e/configuration/SegueGuiceConfigurationModule.java	11.11%	8 Missing ⚠️
...java/uk/ac/cam/cl/dtg/util/mappers/UserMapper.java	40.00%	4 Missing and 2 partials ⚠️
...a/uk/ac/cam/cl/dtg/util/mappers/ContentMapper.java	61.53%	4 Missing and 1 partial ⚠️
.../ac/cam/cl/dtg/isaac/api/managers/GameManager.java	0.00%	4 Missing ⚠️
.../cl/dtg/segue/api/managers/UserAccountManager.java	69.23%	4 Missing ⚠️
.../java/uk/ac/cam/cl/dtg/isaac/api/EventsFacade.java	70.00%	3 Missing ⚠️
...tg/util/mappers/UnimplementedMappingException.java	0.00%	3 Missing ⚠️
...dtg/isaac/dao/PgQuizAttemptPersistenceManager.java	33.33%	2 Missing ⚠️
...ac/cam/cl/dtg/segue/api/managers/GroupManager.java	71.42%	2 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
- Coverage   37.22%   36.94%   -0.28%     
==========================================
  Files         536      533       -3     
  Lines       23706    23560     -146     
  Branches     2857     2819      -38     
==========================================
- Hits         8825     8705     -120     
+ Misses      14003    13982      -21     
+ Partials      878      873       -5     

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[jsharkey13]

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