Return the context in ProcessBatch #106
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Right now, processors can't communicate with each other, which is something I need to do to start doing tracing within them.
By returning a context after ProcessBatch, the processor can change the context and return a new one, which will be used by every underlying processor.
With that, processors will be able to communicate with each other, and more specifically, one will be able to start a span, and another one to finish it (and possibly every other one, to retrieve the span in context and add attributes).