[GPU] use ParallelReadStreamBuf to boost file reading latency

[riverlijunjie]

Details:

• Create custom std::streambuf subclass that internally uses parallel I/O for large reads, exposing a standard std::istream-compatible interface.
• Any code that currently accepts a std::istream gets the speedup transparently — no per-plugin changes required.
• Test result:

Tickets:

• CVS-179677

AI Assistance:

• AI assistance used: no / yes
• If yes, summarize how AI was used and what human validation was performed (build/tests/manual checks).