More efficient SegmentMetadataQuery

[jon-wei]

Addresses issue #2081

This PR makes 3 changes:

• During merging of SegmentMetadataQuery results, condensing of intervals is postponed. The merging will now just append intervals to the LHS result from the RHS result. JodaUtils.condenseIntervals is now only called when returning a result from the query result Yielder.
• Adds "Interval" as a AnalysisType to the SegmentMetadataQuery. This determines if the query will return the list of intervals associated with the queried segments.
• Changes the interval endTime on FireHydrants persisted by RealtimePlumber to use the interval of their Sink which is bucketed by segment granularity, instead of getInterval() on the hydrant's index, which has an end time determined by the max ingested event time. This should help with condensing of intervals.

Running with a 3,450 segment test set on my laptop, the SegmentMetadataQuery takes ~16s to complete without the patch, and ~70ms with the new interval condensing behavior.

[himanshug]

@jon-wei this might be in conflict with #1995 , can you review/merge that one? I think it is ready and very useful to me in many use cases.

[himanshug]

@Nullable is not valid probably. I think IDE is adding it automatically ?

[jon-wei]

@himanshug Hm, yes, it was added by IDE since it was part of the Function interface definition. I've removed the @nullables.

[himanshug]

👍

[jon-wei]

@himanshug Merged your other PR, resolving conflicts

[himanshug]

@jon-wei see if you need to make changes similar to #2112

[jon-wei]

@himanshug This one's fine in that respect, the result output won't change since the query uses default analysis types

[fjy]

👍

[himanshug]

@jon-wei pls see #2129