Migrate the app (ktransformers) to SYCL/oneAPI

Target to migrate https://github.com/kvcache-ai/ktransformers.git to SYCL with the SYCLomatic tool: Analysis the migration gap, and fix the migration gap if possible.

1. Migrate each CUDA file to SYCL file with the SYCLomatic tool.

2. Build the SYCL file with SYCL compiler, fix the issues manually.

   a. For API/ASM not supported by the tool, it’s better to manual write an equal functionality with SYCL/oneAPI lib (which can be used to extent the migration capability of SYCLomatic).
   b. Or, Just comment out to make sure other code build well if SYCL/oneAPI side doesn’t have similar functionality.

3. Report migration issue if there is CUDA code does not migrate well.

   a. It’s better to have small reproducer for each migration issues.

4. Doc the migration steps and manual fix details.

a. Ref to readme file available in: https://github.com/oneapi-src/SYCLomatic-test/tree/SYCLomatic/third-party-programs/Velocity-Bench

5. Commit the migration as test case into SYCLomatic-test repo.

a. Ref to: https://github.com/oneapi-src/SYCLomatic-test/tree/SYCLomatic/third-party-programs/Velocity-Bench

6. For issues in step3, fix in SYCLomaitc if possible with some guide.

Start with the SYCLomatic-test README for third-party-programs/Velocity-Bench and compare its migration layout with the ktransformers repository. Run SYCLomatic against each CUDA file, then build the resulting SYCL files with a SYCL compiler and record unsupported APIs or assembly in small reproducers. Done means the migration, manual fixes, documentation, and test-case commit are complete.