Changed the config for stream manager to support config of initial settings and connection manual window update.
Optimize: When connection manual window management is disabled, update the connection window size to max to minimize the affect of flow control. Make it like no flow control at all.
TODO:
Maybe should do the similar thing that if stream level flow control is disabled, we should just add one initial setting to make the stream window initial from max.
TODO: Maybe should do the similar thing that if stream level flow control is disabled, we should just add one initial setting to make the stream window initial from max.