Option to use a distinct `stream_buffer` for a specific stream

[oliver-zehentleitner]

Is your feature request related to a problem? Please describe. If someone wants to use two different !userData streams, then its much easier if they use their own stream_buffer.

Describe the solution you'd like A switch to enable the use of an own stream buffer when creating a new stream like: manager.create_stream("trade", "btcusdt", use_distinct_stream_buffer=True)

Receives are written to self.stream_buffers[stream_id] and can get accessed via pop_stream_data_from_stream_buffer(stream_id).

Describe alternatives you've considered

Additional context

[oliver-zehentleitner]

use shared stream_buffer