[Discussion] Adding BufferManager and ThreadPool utilities

- BufferManager: A centralized mechanism to manage memory buffers efficiently, particularly in scenarios involving high-frequency data processing, streaming, or caching, also control the memory usage and deal with user provided memory.
- ThreadPool: A reusable pool of threads to manage task execution and improve concurrency without overwhelming system resources.

No source files, tests, or entry points are named. Start by reading the issue discussion and surveying the repository architecture to identify where buffer management and thread-pool utilities would belong. Done should be defined by an agreed scope, API, resource behavior, and validation plan before implementation begins.

Written by the indexing model from the issue text.