[FIX] rapids_find_package() called with explicit version and REQUIRED should fail

[trxcllnt]

Calling rapids_find_package(<pkg> <version> EXACT REQUIRED) should cause find_package to fail due to not finding the specified version, but it doesn't because the REQUIRED flag is placed in front of the version in the find_package() call.

[robertmaynard]

The documentation for rapids_find_package states the arguments are:

rapids_find_package(<PackageName> [REQUIRED] ... [ FIND_ARGS])

Which would mean that REQUIRED is supported before a version value.

We have a couple of options:

1. We remove REQUIRED from the documented supported values to rapids_find_package
2. We add a single parameter field VERSION which we use to properly propagate the version value (
3. We magically see if we can find a version value in the user arguments.

In addition the tests should be using the FIND_ARGS positional sentinal value before the version value, EXACT, and config.

[robertmaynard]

This looks good, but can we add in-line examples to these

[robertmaynard]

@gpucibot merge