[TRTLLM-5589] feat: Minor optimizations for tunable FP8 batched GEMM op.

[hyukn]

Revise some implementations in the tunable FP8 batched GEMM op to reduce Python overhead for the original #4872.
The class TuningConfig is hashable so that the same contents will be converted to the same hash value. This will not cause any cache key miss. But it can introduce extra overheads for the inference phase.

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