Needed Fix to aux2d Dimensions

[drnimbusrain]

Description

There is a bug in dimension definition for the 2D auxiliary array.

This can only be identified if a user only wants to output 2D auxilarly arrays, and will face CCPP prebuild errors that clearly show the inconsistency.

    raise Exception('Dimension {}, required by variable {}, not defined in host model metadata'.format(
Exception: Dimension number_of_3d_auxiliary_arrays, required by variable auxiliary_2d_arrays, not defined in host model metadata

This bug exists in the CCPP auxiliary ReadTheDocs in the section describing needed meta file changes for ccpp related codes:

https://ccpp-techdoc.readthedocs.io/en/latest/ParamSpecificOutput.html#output-of-auxiliary-arrays-from-ccpp

To fix the bug, a change is needed to the following file:

ccpp/data/GFS_typedefs.meta

Proposed Change (in bold below)

[aux2d]
standard_name = auxiliary_2d_arrays
long_name = auxiliary 2d arrays to output (for debugging)
units = none
dimensions = (horizontal_loop_extent,number_of_xy_dimensioned_auxiliary_arrays)
type = real
kind = kind_phys
active = (number_of_xy_dimensioned_auxiliary_arrays > 0)

Output

    raise Exception('Dimension {}, required by variable {}, not defined in host model metadata'.format(
Exception: Dimension number_of_3d_auxiliary_arrays, required by variable auxiliary_2d_arrays, not defined in host model metadata

Testing:

1. Have you tested the code changes? On what platforms?
   RDHPCs Hera

2. Have you run regression test in ufs-weather-model or ufs-s2s-model with code changes?
   No, not needed.

Dependent PRs:

#833