(related to #2244) LFRic tiled colouring

[sergisiso]

Currently this PR is just to monitor the changes, tests and coverage or the LFRic tiled colouring implementations. It is unclear if we should merge this now or wait until the colouring code is refactored so that it can be encapsulated inside its associated transformation instead of spread it around the code.

[codecov]

Codecov Report

Attention: Patch coverage is 81.11588% with 44 lines in your changes missing coverage. Please review.

Project coverage is 99.79%. Comparing base (816177c) to head (ce6c13a).

Files with missing lines	Patch %	Lines
src/psyclone/dynamo0p3.py	74.48%	25 Missing ⚠️
src/psyclone/domain/lfric/lfric_loop.py	79.24%	11 Missing ⚠️
src/psyclone/domain/lfric/lfric_kern.py	68.18%	7 Missing ⚠️
src/psyclone/transformations.py	97.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2750      +/-   ##
==========================================
- Coverage   99.88%   99.79%   -0.10%     
==========================================
  Files         356      356              
  Lines       49480    49674     +194     
==========================================
+ Hits        49422    49570     +148     
- Misses         58      104      +46     

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