【Hackathon 9th No.56】Unit test for get_data_ptr_ipc

[cloudforge1]

Add unit tests for the get_data_ptr_ipc utility.

Source: custom_ops/gpu_ops/cpp_extensions.cc and Python wrappers in fastdeploy/cache_manager/ops.py
Test file: tests/operators/test_get_data_ptr_ipc.py

Retrieves IPC-compatible data pointers for cross-process GPU memory sharing. Test pointer retrieval and basic functionality. May need special handling for IPC.

Branch: task/056-get-data-ptr-ipc-test