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d5bf540079
In preparation for supporting more than one algorithm for lookups in the promoted index, extract relevant logic out of the index_reader (which is a partition index cursor). The clustered index cursor implementation is now hidden behind abstract interface called clustered_index_cursor. The current implementation is put into the scanning_clustered_index_cursor. It's mostly code movement with minor adjustments. In order to encapsulate iteration over promoted index entries, clustered_index_cursor::next_entry() was introduced. No change in behavior intended in this patch.