metal : add `CONV_TRANSPOSE_2D` (llama/16542)

metal : add `CONV_TRANSPOSE_2D` (llama/16542)

* initial: headers and metal-device.cpp updates

* adding conv_transpose_2d

* fix type

* fix type: int32->int64

* Update ggml/src/ggml-metal/ggml-metal.metal

Co-authored-by: Georgi Gerganov <redacted>
* Update ggml/src/ggml-metal/ggml-metal.metal

Co-authored-by: Georgi Gerganov <redacted>
* Update ggml/src/ggml-metal/ggml-metal.metal

Co-authored-by: Georgi Gerganov <redacted>
* add checks for src[0] and src[1]; add type checks

* Update ggml-metal.metal

Co-authored-by: Georgi Gerganov <redacted>
* add more tests, add optimization to threading

* add dynamic memory allocation in metal

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Co-authored-by: Georgi Gerganov <redacted>