cmake: provide CMake helper macros for argument validation

This commit provides a number of helper macros for verifying arguments
passing to function:
- zephyr_check_flags_required
- zephyr_check_arguments_required
- zephyr_check_arguments_required_all
- zephyr_check_flags_exclusive
- zephyr_check_arguments_exclusive

which facilitates checking whether a required argument or flag has been
given or if mutual exclusive arguments are given.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>