metal: add col2im_1d op (f32/f16/bf16) (#25176)

• metal: add col2im_1d op (f32/f16/bf16)

Gather kernel mirroring the CPU/CUDA path: each output (t_out, oc) reads its ceil(K/s0) source columns with an F32 accumulator, a single write and no atomics. One thread per output element, 256 per threadgroup.

• metal: check dst contiguity and type match in supports_op for COL2IM_1D

Align the GGML_OP_COL2IM_1D predicate with the CPU, CUDA, and Vulkan backends: the kernel writes dst with linear indexing and assumes the same type as src0, so supports_op must also require a contiguous dst and op->type == op->src[0]->type.

• Update ggml/src/ggml-metal/ggml-metal.metal

Co-authored-by: YiChen Lv [email protected]

Co-authored-by: YiChen Lv [email protected]