CMake: Warn Unknown Build Type

[ax3l]

Warn if a build type passed by a user is not known in project build.

CMake Warning at cmake/HiPACEFunctions.cmake:76 (message):
  CMAKE_BUILD_TYPE 'adsads' is not one of
  Release;Debug;MinSizeRel;RelWithDebInfo.  Is this a typo?
Call Stack (most recent call first):
  CMakeLists.txt:94 (set_default_build_type)

Summary:

  Build type: adsads (unknown type, check warning)

This helps if one accidentially writes debug instead of Debug, for instance. The result of a custom type that is undefined are no compiler (optimization/debug) flags at all...

Same as ECP-WarpX/WarpX#2088

• Small enough (< few 100s of lines), otherwise it should probably be split into smaller PRs
• Tested (describe the tests in the PR description)
• Runs on GPU (basic: the code compiles and run well with the new module)
• Contains an automated test (checksum and/or comparison with theory)
• Documented: all elements (classes and their members, functions, namespaces, etc.) are documented
• Constified (All that can be const is const)
• Code is clean (no unwanted comments, )
• Style and code conventions are respected at the bottom of https://github.com/Hi-PACE/hipace
• Proper label and GitHub project, if applicable

[SeverinDiederichs]

Thanks for this useful safety check!