dynamic_buffer_stream specifications

• dynamic_buffer_stream_default_cfg() specifications
• dynamic_buffer_stream_default_env() specifications
• dynamic_buffer_stream_create_stream() specifications
• dynamic_buffer_stream_create_desc() specifications
• dynamic_buffer_stream_read() specifications
• dynamic_buffer_stream_write() specifications
• dynamic_buffer_stream_flush() specifications
• dynamic_buffer_stream_close() specifications