b9939

metal : add CONV_2D_DW (depthwise convolution) support (#21565)

• metal : add CONV_2D_DW (depthwise 2D convolution) support

• test : add perf cases for CONV_2D_DW

• metal : use 3D dispatch for CONV_2D_DW kernel

• metal : add channel-tiled CONV_2D_DW kernel for non-contiguous layouts

• metal : simplify CONV_2D_DW dispatch and trim comments

• metal : merge duplicate CONV_2D_DW pipeline getters

• tests : add F16 CONV2D_DW tests

• cpu : fix F16 kernel support for CONV_2D_DW

• tests : remove commented-out CONV_2D_DW test block

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Co-authored-by: Georgi Gerganov ggerganov@gmail.com

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