Refine Unzip v2: Parallelism in Expert Dimensions

[pesionzhao]

Before submitting

• Lint code. If there are lint issues, please format the code first.

# Install and register `pre-commit` in the project folder
pip install pre-commit && pre-commit install

# Process previous code files separately
pre-commit run --file XXXX.py

• Add test cases into tests folder. If there are codecov issues, please add tests cases first.

PR types

Performance optimization

PR changes

APIs

Description

Refine #10742 v1 -> v2
Reduce execution time using parallelism in expert dimensions

[paddle-bot]

Thanks for your contribution!