GetBuffer is similar to GetBytes, but it returns the bytes buffer wrapped by bytes.Buffer.

GetBytes gets a bytes buffer from the pool, which can specify with a size, default is 32k.

Put puts the buffer(either Bytes or BytesBuffer) back to the pool.

WithBuffer relies on GetBuffer to get a buffer, calls the function with the buffer, finally, puts it back to the pool after the function returns.

WithBytes relies on GetBytes to get a buffer, calls the function with the buffer, finally, puts it back to the pool after the function returns.