CMake components

[rbberger]

PR Summary

Rewrites the CMake targets and installation to split up Interface and Library components.

Closes #323

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the make format command after configuring with cmake.
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• After creating a pull request, note it in the CHANGELOG.md file.
• LANL employees: make sure tests pass both on the github CI and on the Darwin CI

If preparing for a new release, in addition please check the following:

• Update the version in cmake.
• Move the changes in the CHANGELOG.md file under a new header for the new release, and reset the categories.

[rbberger]

@dholladay00 looks like https://github.com/lanl/singularity-eos/blob/main/test/test_eos_modifiers.cpp is broken, since SINGULARITY_BUILD_CLOSURE was never passed on to the test code and therefore always ignored. Now that it's passed on the code shows that it's invalid in its current form.

[rbberger]

@mauneyc-LANL the CI fix was actually quite simple. All I needed was avoid the inclusion of the closure header.

[mauneyc-LANL]

@mauneyc-LANL the CI fix was actually quite simple. All I needed was avoid the inclusion of the closure header.

Looked simple, I will review once passes

[rbberger]

@jhp-lanl @Yurlungur tested this in the SAP integration branch.

[Yurlungur]

LGTM. Minor nitpick below, which I consider nonblocking. Also please modify changelog. And, if the instructions for linking to the library in downstream codes has changed, please update the docs.

[Yurlungur]

It might be best to have variable like BUILD_LIBRARY that (for now) automatically is set by BUILD_CLOSURE so that we can extend in the future if needed.

[mauneyc-LANL]

@rbberger a conflict popped up, I think with a change @jonahm-LANL made last week.