llama.cpp/examples/speculative

Demonstration of speculative decoding and tree-based speculative decoding techniques

More info:

• https://github.com/ggml-org/llama.cpp/pull/2926
• https://github.com/ggml-org/llama.cpp/pull/3624
• https://github.com/ggml-org/llama.cpp/pull/5625