[tools] Add concurrent read_segment_files validation option #2833
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What this PR does / why we need it:
Allows read_segment_files to be run in a pure validation mode and run concurrently (by default num CPUs / 2).
Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: