This is a new API call for streamers. It will allow peeking into the
internal settings of streamers.
The exact content of this call is device-specific. It varies a lot
between RFNoC- and non-RFNoC devices.
It can be used as follows:
```python
my_usrp = uhd.usrp.MultiUSRP(device_args)
rx_streamer = my_usrp.get_rx_stream(stream_args)
print(rx_streamer.get_stream_info(0)) # Shows info about the streamer
```
For most use cases, this API is not required. It can help for debugging
(e.g., compare flow control parameters with expectations, or identify
EPIDs for a better understanding of Wireshark output), or it can be used
for remote streaming, when a 3rd party application needs to know
internal settings of streamers.
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