Add "Exact answers only" option to coordinate questions

[axlewin]

Adds an option for "Exact answers only" (disregardSignificantFigures) for coordinate questions. This works the same way as it does for numeric questions, i.e. validates that two values are exactly numerically equivalent without considering significant figures.

This enables coordinate questions to be used for cases where different values in the choice need to be given to different significant figures (e.g. (1, 2.34)).

[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.95%. Comparing base (05060c4) to head (23eccee).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...am/cl/dtg/isaac/quiz/IsaacCoordinateValidator.java	72.22%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #772   +/-   ##
=======================================
  Coverage   39.94%   39.95%           
=======================================
  Files         547      547           
  Lines       23840    23852   +12     
  Branches     2887     2892    +5     
=======================================
+ Hits         9523     9530    +7     
- Misses      13415    13417    +2     
- Partials      902      905    +3     

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