Add Fortran access to device data through Field and FieldSet

[sbrdar]

• add access to the device pointer in atlas_Field_module and atlas_FieldSet_module for the 'deviceptr' clause of OpenACC
• add sync_host_device;

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.39535% with 161 lines in your changes missing coverage. Please review.

Project coverage is 79.44%. Comparing base (44850d9) to head (a7897b9).
Report is 36 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/atlas_f/field/atlas_FieldSet_module.fypp	0.00%	128 Missing ⚠️
src/atlas/field/detail/FieldInterface.cc	0.00%	21 Missing ⚠️
src/atlas/array/ArraySpec.cc	64.70%	6 Missing ⚠️
src/atlas_f/field/atlas_Field_module.fypp	0.00%	4 Missing ⚠️
src/atlas/array/Array.h	0.00%	1 Missing ⚠️
src/atlas/field/detail/FieldImpl.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #232      +/-   ##
===========================================
- Coverage    79.63%   79.44%   -0.20%     
===========================================
  Files          802      818      +16     
  Lines        55171    56289    +1118     
===========================================
+ Hits         43933    44716     +783     
- Misses       11238    11573     +335     

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[wdeconinck]

Reviewed offline and changes have been pushed.
Thanks for this nice work allowing us to now use !$acc data deviceptr clause in Fortran!

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