(closes #1312) fix scalar array functionality

[mo-alistairp]

The gh_scalar_array functionality is not working as intended (#1312). The generated kernel subroutine includes an array of the extents of the dimensions of the scalar array in the the list of arguments. This isn't being generated in the corresponding invoke call. As a result the mismatch in arguments causes build errors when gh_scalar_array is used.

This was likely because kern_call_invoke_arg_list.py was missed. This wasn't picked up by testing because the algorithm layer doesn't get compiled. As a way to verify that this functionality does work I'll also add an example using gh_scalar_array that gets compiled to ensure that it builds correctly. I'll probably also add a bit more documentation to aid users.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2cd1054) to head (730eece).
⚠️ Report is 42 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3520   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          397       397           
  Lines        55556     55590   +34     
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+ Hits         55556     55590   +34     

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