fix:Improve rust unit test and optimize concurrent tests with rayon

[OneZero-Y]

What type of PR is this?

what's changed

• Improve rust unit test ，add 6 new unit test files
• optimize concurrent tests with rayon, Replaced manual std::thread::spawn with rayon::par_iter()

Impact

• Scope: Test code only

Which issue(s) this PR fixes:

part of #266

Release Notes: Yes/No

[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 candle-binding

Owners: @rootfs
Files changed:

• candle-binding/src/core/similarity_test.rs
• candle-binding/src/core/tokenization_test.rs
• candle-binding/src/ffi/init_test.rs
• candle-binding/src/ffi/state_manager_test.rs
• candle-binding/src/ffi/validation_test.rs
• candle-binding/src/model_architectures/lora/lora_adapter_test.rs
• candle-binding/src/classifiers/lora/parallel_engine_test.rs
• candle-binding/src/core/mod.rs
• candle-binding/src/ffi/mod.rs
• candle-binding/src/model_architectures/lora/mod.rs

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🎉 Thanks for your contributions!

This comment was automatically generated based on the OWNER files in the repository.

[rootfs]

thank you @OneZero-Y

i am now much behind, will start once #239 is done