Add build-CI (ACCESS-NRI#5)

Cmake build for ACCESS3 (ACCESS-NRI#2)

This adds a CMake build for ACCESS3 models.

By default, it builds some WW3 utilities and the shell test program. If WW3_ACCESS3 is ON, it builds a library for access3 models (and using the https://github.com/ACCESS-NRI/access3-share dependencies)

* This was based on the https://github.com/cOSIMA/access-om3 CMake

Co-authored-by: Micael Oliveira <micael.Oliveira@anu.edu.au>