Merge Asynchronous and Synchronous sum aggregations

[ocelotl]

Fixes #2353

[aabmass]

I know in my original prototype and doc, we had collect() -> Optional[Point] so that "the aggregations may also return None if no measurements were seen in this interval–the metric reader won't see see the point in this case." I remember there being some specification discussion around whether or not this is correct, but can't dig anything up.

Given the confusion and fact that this would be an optimization, should put that off till later and just do the simple thing to start?

[ocelotl]

I know in my original prototype and doc, we had collect() -> Optional[Point] so that "the aggregations may also return None if no measurements were seen in this interval–the metric reader won't see see the point in this case." I remember there being some specification discussion around whether or not this is correct, but can't dig anything up.

Given the confusion and fact that this would be an optimization, should put that off till later and just do the simple thing to start?

All right, removed any association between self._value and None 😆

[codeboten]

Please address conflicts.

[ocelotl]

Please address conflicts.

Done, @aabmass plese review ✌️