* fix: add GIL for pybind11::bytes object accessing
Protect the access to the pybind11::bytes object with a GIL lock to avoid potential memory errors, and unify the handling of empty and non-empty strings. Eliminate unused functions for empty byte objects in the export channel and export RPC modules to enhance code clarity.
* docs: resolve occasional server crash during multi-threaded RPC calls
Address a rare issue causing server crashes in aimrt_py under multi-threaded RPC operations, enhancing stability and reliability.
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