Update to data type amip_interp_type

[ganganoaa]

Description
This is a minor update to avoid possible memory leaks in the future. The pointer members, 'data1', and 'data2', were upgraded to allocatables since pointers are prone to cause memory leaks if not properly handled. A missing assignment statement related to data member, 'Hintrp2', was inserted to follow the principle of object-to-object copy.

Fixes #1099

How Has This Been Tested?
'make check' and 'make distcheck' were ran without any issues. The following setup was used for compiler, MPI wrapper, and required packages:

• oneapi v2022.2
• hdf5 v1.12.0
• tbb v2021.6.0
• oclfpga v2022.1.0
• netcdf v4.8.0
• mpi v2021.6.0
• compiler-rt v2022.1.0
• compiler v2022.1.0

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[rem1776]

Looks good! For future reference you shouldn't need to put a 'added by' comment, we can see who added each line with git blame.