2263 splitting LFRic scalar args

[oakleybrunt]

closes #2263

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (65db1a8) 99.84% compared to head (a106c3e) 99.84%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2264   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files         342      343    +1     
  Lines       46069    46077    +8     
=======================================
+ Hits        45998    46006    +8     
  Misses         71       71           

Files Changed	Coverage Δ
src/psyclone/domain/lfric/__init__.py	100.00% <100.00%> (ø)
src/psyclone/domain/lfric/lfric_invoke.py	100.00% <100.00%> (ø)
src/psyclone/domain/lfric/lfric_scalar_args.py	100.00% <100.00%> (ø)
src/psyclone/dynamo0p3.py	99.81% <100.00%> (-0.01%)	⬇️

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[TeranIvy]

Nice work! There are some minor comments and clean-ups (see inline).

Tests with compilation work and examples pass. I didn't check documentation in this instance, but grepping for LFRicScalarArgs only returns source and test changes so I think we're fine here.

Also, the branch needs updating with master. I'd advise doing that in a separate commit to review corrections.

[TeranIvy]

All review comments are addressed. Tests with compilation pass except for an unrelated test. It is not the fault of this PR and it is exposed by using GCC 11.2.0 compiler which is stricter in syntax.
Documentation builds fine. Examples run.
After updating the user guide and changelog I will proceed to merge the branch.

[TeranIvy]

CI passed, proceeding to merge.