[hipDNN] Add CLI args to samples for configurable execution

[SamuelReeder]

Allow specifying runtime configuration when running samples via command-line arguments. Ideally, they will support the following arguments:

Argument	Description	Example
--engine-id	Preferred engine ID for execution	--engine-id 2
--dtype	Data type (fp32, fp16, bf16)	--dtype fp16
--layout	Tensor layout	--layout nhwc
--dims	Input tensor dimensions	--dims 32,64,224,224
Operation-specific	Conv: filter, stride, padding, dilation. BN: eps, momentum	--filter 3,3 --stride 2,2

Currently, all params are hardcoded and the run() helper iterates through fixed type/layout combinations rather than allowing user selection.

The benefit of these params being specifiable is that plugin devs can easily test their plugin by setting an engine ID and running supported operations.