(Closes #2612) add support for length attribute in character type

[arporter]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (c54c5f1) to head (c1bbb7f).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3377    +/-   ##
========================================
  Coverage   99.95%   99.95%            
========================================
  Files         387      388     +1     
  Lines       54315    54478   +163     
========================================
+ Hits        54293    54456   +163     
  Misses         22       22            

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[arporter]

This is a little bigger than I'd have liked because, in quite a few tests, we use character as a "type that we don't support". I've kicked this can down the road a bit by switching to complex but we will also want to add support for that soon. Perhaps at that point there will be no basic type that we don't support?

[arporter]

Something goes very wrong in the NEMO ITs:

I don't have a test with len=some_intrinsic(arg)...

[arporter]

NEMO ITs now failing at L274 of acc_kernels_trans.py with:

    if isinstance(sym.datatype.length,
406
                  ^^^^^^^^^^^^^^^^^^^
407
AttributeError: 'UnsupportedFortranType' object has no attribute 'length'
408

when processing crslbclnk.f90.