Give API statistics access to transcoded streams

[SceneCityDev]

Via the API you right now can get information about a stream, like this:

http://hostname:8081/v1/stats/current/vhosts/default/apps/app/streams/mystream

However, what is not possible is to get the information about the available transcodes. This information is very interesting, because right now you can only find out the total number of viewers for all encodes, but not viewers per transcode.

Something like this would be great:

http://hostname:8081/v1/stats/current/vhosts/default/apps/app/streams/mystream/encodes/video_bypass