Create `numba_dppy` version of `compiler.Flags()` which is configured with `numba_dppy.config`

[PokhodenkoSA]

Setting debuginfo to default value inside compiler.Flags() sounds like a great idea, if possible

Originally posted by @AlexanderKalistratov in https://github.com/IntelPython/numba-dppy/pull/424#discussion_r649947552