[core] Skip stats from schema in DataEvolution when column type has changed

[ArnavBalyan]

Purpose

• Stats merges today ignores type changes during schema evolution. After alter table changes (eg Int to String), stats from older files written under the prior schema are merged in under the new type.
• When types mismatch, this causes garbage stats to be accumulated which causing wrong pruning/silently data drop.
• Ensure we can detect this mismatch and skip the stats for such cases.

Tests

• UT