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backport projections #17257

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clintropolis
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Backport #17064, #17065, #17214 to 31.0.0

…nt "views" of the data based on the cursor build spec (apache#17064)

* abstract `IncrementalIndex` cursor stuff to prepare to allow for possibility of using different "views" of the data based on the cursor build spec
changes:
* introduce `IncrementalIndexRowSelector` interface to capture how `IncrementalIndexCursor` and `IncrementalIndexColumnSelectorFactory` read data
* `IncrementalIndex` implements `IncrementalIndexRowSelector`
* move `FactsHolder` interface to separate file
* other minor refactorings
* add DataSchema.Builder to tidy stuff up a bit

* fixes

* fixes

* more style fixes

* review stuff
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