[wasi-nn]Add a new target for llama.cpp as a wasi-nn backend

[lum1n0us]

Minimum support:

• [x] accept (WasmEdge) customized model parameters. metadata.
• [x] Target wasmedge-ggml examples
  • [x] basic
  • [x] chatml
  • [x] gemma
  • [x] llama
  • [x] qwen

---

In future. To support if required.

• [ ] Target wasmedge-ggml examples
  • [ ] command-r. (>70G memory requirement)
  • [ ] embedding. (embedding mode)
  • [ ] grammar. (use the grammar option to constrain the model to generate the JSON output)
  • [ ] llama-stream. (new APIS compute_single, get_output_single, fini_single)
  • [ ] llava. (image representation)
  • [ ] llava-base64-stream. (image representation)
  • [ ] multimodel. (image representation)
• [ ] Target llamaedge

[lum1n0us]

core/iwasm/libraries/wasi-nn/test/Dockerfile.wasi-nn-smoke needs more work. Will update it in another PR.