[WIP] feat: CMake improvements and Catch2 migration

[LecrisUT]

• [x] Add message context: nice message displays
• [ ] Add FeatureSummary: Nice overview display
  • need to move the dependency checks to the top-level
• [x] Add dependent options: More useful default values, e.g. if BUILD_TESTS is not enabled, COVERAGE should always be disabled
• [x] Refactor examples:
  • These are now standalone projects that show from start to finish, how one should consume this project
  • One caveat about the current interface is that BUILD_EXAMPLES implies that we want to install these examples. Is that really what we want? It can be partially simplified if it is only part of the tests. @pboettch thoughts on this?
  • What is readme example?
• [ ] Convert issue tests to catch2
• [ ] Investigate JSON-Schema-Test-Suite
• [ ] Fix clang-tidy pre-commit issues. Seems to be complaining about the CMake script. Revert "[Temp] Disable clang-tidy"

Closes #266