Support filtering on _time with column scan #2673
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This PR allows filters to be applied to the special __time column which does not have a dictionary/bitmap index.
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.
Fixes #2652