Fused MoE ffn_up and ffn_gate (#229)

* Fusing MoE up * unary(gate)

* Fusing MoE up * unary(gate): CUDA

We get ~13% speedup for PP-512 and ~2% for TG-128
for DeepSeek-Lite

* On CUDA also fuse MoE down * (up * unary(gate))

in case the MUL_MAT_ID op for the down experts is the next
op in the graph.

* Command line option to enable fused MoE up*unary(gate)

* Add fmoe option to llama-bench

* Adding forgotten gelu, relu, silu on ARM

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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>

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