Fix DataSegment interning in SQLMetadataSegmentManager

[surekhasaharan]

Addresses #6358

• added trueEquals method to DataSegment to do complete equality check of DataSegment objects
• make replaceWithExistingSegmentIfPresent in SQLMetadataSegmentManager usetrueEquals

[leventov]

The PR doesn't appear to be complete to implement this plan: #6358 (comment). Also "trueEquals()" name is not objective. Suggested either "allDataEquals()", or "allMetadataEquals()", or "metadataEquals()".

[hellobabygogo]

this patch will case young gc and old gc pressure increase.

[stale]

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[stale]

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