[4/N]Elastic EP support deepep backend

[HanHan009527]

Motivation

using pr deepseek-ai/DeepEP#370

check our 1,2,3 #10606

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.