Bug fix for chunked array support in ccpp_prebuild

[climbfuji]

Small bug fix required to use chunked arrays and retain backward compatibility with blocked data structures in ccpp_prebuild.py

This PR is a small bug fix in order to provide backward compatibility with blocked data structures. Specifically, we need to check if the host model variable is a contiguous array (it's horizontal dimension is CCPP_HORIZONTAL_DIMENSION) or part of a blocked data structure (it's horizontal dimension is CCPP_HORIZONTAL_LOOP_EXTENT).

User interface changes?: No

Resolves https://github.com/NCAR/ccpp-framework/issues/539

Testing:

• test removed: none
• unit tests: capgen tests in test all pass; prebuild tests in test_prebuild all pass
• system tests: doctests in test al pass
• manual testing: tested extensively in my (yet to be created) PRs that convert all UFS DDTs from blocked data structures to chunked arrays

Dependencies/associated PRs:

This is part of a set of (independent) PRs:

• https://github.com/NCAR/ccpp-framework/pull/538
• https://github.com/NOAA-EMC/fv3atm/pull/792
• https://github.com/ufs-community/ufs-weather-model/pull/2164

[climbfuji]

Does this work if you have 'chunked' data but only one chunk? I don't see why it shouldn't but wondered if this is something you test.

Yes, it works in that case, too. Thanks for the quick review!

[climbfuji]

@grantfirl UFS testing for this PR is complete. Can you add your final review please and merge if ok? Thanks!

[zach1221]

Good morning, @grantfirl . Testing is complete on UFS-WM PR #2164. Can you please merge this PR for us?