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[SYSTEMDS-3527] CLA DeltaOffset Skip list #1812

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New version of old PR, that does not contain multiple component changes.

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Old PR #1801

@Baunsgaard Baunsgaard changed the title [???] many smaller optimizations for CLA and ULA [SYSTEMDS-3527] CLA DeltaOffset Skip list Apr 24, 2023
This commit implements a skip list of the delta offsets,
the list is materialized at calls to getting an offset iterator
at an arbitrary row, and is hidden behind a SoftReference.
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