Moved otel support for polling into poller #3279
                
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Removed custom code from
create_certificateAPI code and moved the corresponding logic into thePoller.This involved adding an additional parameter to the
callbackforPoller::with_callbackthat provides thectxused for the pipeline.Bonus: Instead of using a tuple to maintain the state of the "stream" created by the
Poller, encapsulate the state in a structure to make it easier to modify the state of the "stream" moving forward (when there were 3 fields in the state, it wasn't a huge deal, but with 5 fields, it was getting unwieldy).NOTE: This is still a draft PR, the next step is to work on similar changes for pagers.