Expose get stream method

[cyx-6]

This PR exposes the get env stream method as followup of #5.

[gemini-code-assist]

Summary of Changes

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This pull request exposes a new get_raw_stream method within the tvm_ffi.stream module, allowing users to retrieve the current FFI stream associated with a given device. This is achieved by adding a Cython binding (_env_get_stream) to an internal C++ function, defining the public Python API, and updating the module's __init__.py. New test assertions confirm the method's correct behavior, particularly within use_raw_stream contexts.

Highlights

• Intent: This pull request aims to expose a method to retrieve the current FFI stream for a given device, following up on a previous issue (Add stream context #5).
• Changes Overview: The PR introduces a new public function get_raw_stream in the tvm_ffi.stream module. This function allows users to query the currently active stream for a specified device. The implementation involves adding a Cython binding to an internal C++ function (TVMFFIEnvGetStream) and updating the __init__.py to expose the new method. Corresponding tests have been added to verify its functionality within stream contexts.
• File Changes: The changes are distributed across four files:

• python/tvm_ffi/__init__.py: Updated to import the newly exposed get_raw_stream function.
• python/tvm_ffi/cython/base.pxi: A new Cython function _env_get_stream was added to provide a Python-callable wrapper for the internal TVMFFIEnvGetStream C++ function, enabling retrieval of the raw stream pointer.
• python/tvm_ffi/stream.py: The public get_raw_stream function was defined, which takes a tvm_ffi.Device object and uses the new Cython binding to return the current stream as an integer. A comprehensive docstring was also added.
• tests/python/test_stream.py: The test_raw_stream function was enhanced with assertions to confirm that get_raw_stream correctly reports the active stream when use_raw_stream context managers are used, including nested contexts.

• Reviewer Activity: No specific reviewer activity or comments were provided in the context.

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Code Review

This is a great pull request that is well-structured and includes the necessary tests. I've found one issue that should be addressed.