streamd: implement /state API to fetch the current pipeline state #4
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This API may be used when implementing a service status indicator for a streaming service. It returns the raw GStreamer state for the main pipeline.
Four states shall be returned:
PLAYINGPAUSEDREADYNULLIf the pipeline is in
PLAYING, it is up and running. Sinks accept and render data. Live sources produce data. The streaming service is therefore active. Every other state indicates that the service is inactive or degraded.