Support filtering on _time with column scan

[jon-wei]

This PR allows filters to be applied to the special __time column which does not have a dictionary/bitmap index.

• Updates makeValueMatcher functions in IncrementalIndexStorageAdapter to support __time column
• Adds a function for performing a full scan on the __time column to ColumnSelectorBitmapIndex.

A benchmark has been included for comparing the performance of a full scan on __time vs. bitmap index-based filtering on a String column that contains ISO timestamps.

Example results for various cardinalities, loadMainTime reads from the __time column, loadSecondTime reads from the String time column.

250,000 rows

cardinality=1
ColumnScanBenchmark.loadMainTime    avgt   10  11335.082 ± 466.723  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10     51.619 ±   5.596  us/op

cardinality=100
Benchmark                           Mode  Cnt      Score     Error  Units
ColumnScanBenchmark.loadMainTime    avgt   10  11974.823 ± 462.547  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10   1003.198 ±  48.338  us/op

cardinality=2500
Benchmark                           Mode  Cnt      Score      Error  Units
ColumnScanBenchmark.loadMainTime    avgt   10  13735.795 ± 1074.677  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10  10604.697 ±  384.406  us/op

cardinality=25000
Benchmark                           Mode  Cnt      Score      Error  Units
ColumnScanBenchmark.loadMainTime    avgt   10  16357.802 ±  329.982  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10  92038.803 ± 3612.285  us/op

cardinality=50000
Benchmark                           Mode  Cnt       Score      Error  Units
ColumnScanBenchmark.loadMainTime    avgt   10   18931.669 ± 1024.174  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10  166773.346 ± 4018.626  us/op

cardinality=125000
Benchmark                           Mode  Cnt       Score       Error  Units
ColumnScanBenchmark.loadMainTime    avgt   10   29742.121 ±   872.175  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10  500961.399 ± 13750.984  us/op

cardinality=250000
ColumnScanBenchmark.loadMainTime    avgt   10   46596.902 ±  2686.601  us/op
ColumnScanBenchmark.loadSecondTime  avgt   10  998234.222 ± 38658.422  us/op

---

Fixes #2652

[fjy]

header

[fjy]

i wonder fi we should document the list of benchmarks somewhere

will make it easy for developers to test their work

[jon-wei]

@fjy Added header

I can add an initial benchmarks doc to content/development, that sounds useful

[jon-wei]

Closing this pending implementation of #2742