### What this PR does / why we need it? Add a new fusion ops to custom_op, which can cobime the torch.bmm() and transpsose to achieve better peformance. This ops is used in mla_v1 to replace the bmm and transpose ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? - vLLM version: v0.11.2 --------- Signed-off-by: hust17yixuan <303660421@qq.com>