Install CMake files for Chapel projects

[jabraham17]

Adds an install step to move the CMake module files in util/cmake to CHPL_HOME/lib/INSTALL_PREFIX/lib/cmake/chpl

This makes these files readily available to users without needing to copy the files into their project

testing

• build from source with CHPL_HOME build puts the files in the right place
• build from source with prefix build puts the files in the right place
• homebrew changes work as expected
• rpm changes work as expected
• apt/deb changes work as expected