feat(buffer): implement dynamic buffer resizing for simplicity

[MengAiDev]

…adlock prevention

• Add support for dynamic buffer resizing in Buffer class
• Enable resizing based on maximum tokens observed
• Simplify design and eliminate potential deadlocks from queue-based communication
• New parameter dynamic_buffer_resize added to Buffer constructor
• Update README.md to describe new approach and how to enable it

For issue : https://github.com/deepseek-ai/DeepEP/issues/39