lib/dim: add KUnit test for dim_calc_stats()

Add a KUnit suite for the DIM library that checks the packet, byte,
event and completion rates computed by dim_calc_stats(), including
counter wraparound

lib/dim: add KUnit test for dim_calc_stats()

Add a KUnit suite for the DIM library that checks the packet, byte,
event and completion rates computed by dim_calc_stats(), including
counter wraparound and windows whose byte or packet count times
USEC_PER_MSEC does not fit in 32 bits. The latter cases fail on 32-bit
architectures without the previous commit.

Assisted-by: LLM
Signed-off-by: Shashank Mohan Jain <jain.sm@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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