feat(query): add DATE ± INTERVAL -> DATE function

[TCeason]

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Summary

• Added native DateType ± IntervalType -> DateType overloads so pure date math no longer casts through timestamp and reuses the existing day/month evaluators.
• Taught the binder to inspect interval literals when binding +/-: if the interval has no time component we keep the date overload, otherwise we auto-cast to the timestamp overload

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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