ESMX/CMake top level to set the compilers as per esmf.mk

[theurich]

This addresses the issue observed e.g. under https://github.com/esmf-org/esmf-test-artifacts/blob/d4c27618861e8f7e8041036e6bda5361772b7151/release_8.5.0/intel/18.0.5/O/intelmpi/2018.4.274/out/nuopc.log where the ESMX Proto cases do not build correctly.

To address this issue, correctly set CMAKE_*_COMPILER variables on the top level ESMX/CMakeLists.txt file.

Also update minimum ESMF version required to 8.5.0 to be consistent with the latest ESMX version.

Finally also set ESMX version to 1.0.0 in the project() command.

[danrosen25]

This looks good. Note that if the developer is integrating the ESMX Driver into their component they'll skip over the application layer and they will be responsible to set CMAKE_Fortran_COMPILER to match their ESMF build. I think this is acceptable. I'm not going to test these changes because I don't have a reproducer but they look good.

[danrosen25]

Update all cmake_minimum_required in ESMX to require version 3.22 in all CMakeLists.txt files. And update the README file to say that 3.22 is required.

[theurich]

Yes, correct, for user level project integration, the user CMakeLists.txt file is responsible. I made that change in the ESMX_ExternalDriverAPIProto and tested locally and on Hera. I will update the protos at the same time when this PR comes in.

I am working on updating the section in the ESMX/README.md right now that talks about project integration. Will push to the same branch in just a second.

[theurich]

@danrosen25 - all my follow-on changes are in. Please take another a look.

[theurich]

@danrosen25 - I just noticed a typo in the README.md change... typing too fast. Small thing so I won't have you review again. Moving forward with the merge. Thanks!