llama: add support for QRWKV6 model architecture (#11001)

llama: add support for QRWKV6 model architecture (#11001)

llama: add support for QRWKV6 model architecture (#11001)

* WIP: Add support for RWKV6Qwen2

Signed-off-by: Molly Sophia <redacted>
* RWKV: Some graph simplification

Signed-off-by: Molly Sophia <redacted>
* Add support for RWKV6Qwen2 with cpu and cuda GLA

Signed-off-by: Molly Sophia <redacted>
* RWKV6[QWEN2]: Concat lerp weights together to reduce cpu overhead

Signed-off-by: Molly Sophia <redacted>
* Fix some typos

Signed-off-by: Molly Sophia <redacted>
* code format changes

Signed-off-by: Molly Sophia <redacted>
* Fix wkv test & add gla test

Signed-off-by: Molly Sophia <redacted>
* Fix cuda warning

Signed-off-by: Molly Sophia <redacted>
* Update README.md

Signed-off-by: Molly Sophia <redacted>
* Update ggml/src/ggml-cuda/gla.cu

Co-authored-by: Georgi Gerganov <redacted>
* Fix fused lerp weights loading with RWKV6

Signed-off-by: Molly Sophia <redacted>
* better sanity check skipping for QRWKV6 in llama-quant

thanks @compilade

Signed-off-by: Molly Sophia <redacted>
Co-authored-by: compilade <redacted>
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Signed-off-by: Molly Sophia <redacted>
Co-authored-by: Georgi Gerganov <redacted>
Co-authored-by: compilade <redacted>