Support SegmentSelector API to select segment names based on expression

Since Pinot supports batch segments replacement, there is a need to find out what are segments to replace in an existing table based on segment metadata.

E.g. When we want to backfill data on a particular date, we want to find out all the segments for that date.

Sample expression:
1. Find segments for a given time range:
`segment.start.time >= 1614000000 and segment.end.time <1614150000`
2. Find segments for a partition:
`segment.partition.id==1`

Ideally, if we can have a system logical table like `__SEGMENTS_METADATA` then we can direct send a query like:
```
SELECT segment_name FROM __SEGMENTS_METADATA WHERE SEGMENT_START_TIME >= 1614000000 and SEGMENT_END_TIME <1614150000
```
to query segment metadata.

Start by locating the SegmentSelector API and the segment metadata query or expression entry points in Pinot. Compare the time-range and partition examples in this issue with the existing metadata model, then verify that segment names can be selected for both expressions and the proposed logical-table query.

Written by the indexing model from the issue text.