[feat] support dspark (Nanbeige4.2-3B)

[zqlcode]

Overview

Nanbeige4.2 support dspark

Additional information

test

./build/bin/llama-cli \
  -m /Users/admin/Documents/model/nanbeige4.2_3b_preview_0715-Q4_K_M.gguf \
  -md /Users/admin/Documents/model/r19-step8000/nanbeige4.2-3B-DSpark-Q4_K_M.gguf \
  --spec-type draft-dspark \
  --spec-draft-n-max 3 \
  -ngl 99 \
  -ngld 99 \
  -c 4096 \
  -p "Find the sum of all positive integers \$n$ such that \$n + 2$ divides the product 3(\$n + 3)(\$n^2 + 9)."

no dspark

enable dspark

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: YES - used AI assistance for implementation help and review. I reviewed every changed line, tested locally, and take full responsibility for this PR.

[CISC]

I'm guessing it will be DSparkDraftModel arch so no conversion challenges?

[KotPrezesOfficial]

3b model and only 21 tok/sec ?! What did you test it on ?