llama : add Command R Plus support (llama/6491)

llama : add Command R Plus support (llama/6491)

* Add Command R Plus GGUF

* Add Command R Plus GGUF

* Loading works up to LayerNorm2D

* Export new tensors in 1D so they are not quantized.

* Fix embedding layer based on Noeda's example

* Whitespace

* Add line

* Fix unexpected tokens on MPS. Re-add F16 fix. ((Noeda)

* dranger003: Fix block index overflow in CUDA dequantizing.

* Reverted blocked multiplication code as it still has issues and could affect other Llama arches

* export norms as f32

* fix overflow issues during quant and other cleanup

* Type convention

Co-authored-by: Georgi Gerganov <redacted>
* dranger003: Fix more int overflow during quant.

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Co-authored-by: S <redacted>
Co-authored-by: S <redacted>
Co-authored-by: slaren <redacted>
Co-authored-by: Georgi Gerganov <redacted>