[KVCache] Support kv cache scale load

[Sunny-bot1]

Motivation

support static Cfp8 scale load

Modifications

add load_cache_scale for kv_cache_quant_type == "float8_e4m3fn"

Usage or Command

put kv_cache_scale.json in model_path
add quantization_config like:

    "quantization_config":{
        "dense_quant_type":"block_wise_fp8",
        "moe_quant_type":"block_wise_fp8",
        "kv_cache_quant_type":"float8_e4m3fn",
        "quantization":"mix_quant"
    }

Accuracy Tests

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!