Add benchmark for VersionedIntervalTimeline

[jihoonson]

Benchmark for VersionedIntervalTimeline introduced in #7547 (comment).

Description

The primary purpose of this benchmark is to measure how much slower VersionedIntervalTimeline is with segment lock than with timeChunk lock.

Data setup

A synthetic segments were created to emulate the usual compaction scenario where initial segments are created and then they got compacted while new segments are appended. The benchmark first generates numInitialRootGenSegmentsPerInterval segments per interval. Then, it generates numInitialRootGenSegmentsPerInterval * COMPACTED_SEGMENTS_RATIO_TO_INITIAL_SEGMENTS compacted segments which overwrites the segments of the previous generation. It also generates new appending segments. This can be repeated more than once based on numNonRootGenerations.

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This PR has:

• been self-reviewed.