feat(query): support age function

[TCeason]

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Summary

1. support age function

Syntax

-- Subtract arguments, producing a “symbolic” result that uses years and months, rather than just days
age ( timestamp, timestamp ) → interval
-- Subtract argument from current_date (at midnight)
age ( timestamp ) → interval

e.g.

set timezone='America/New_York';

select age('2025-04-10'::date, '1957-06-13'::date);
----
67 years 9 months 27 days

select age('1957-06-13'::timestamp);
----
67 years 11 months 28 days

2. fix to_month(IntervalType);

In main:

select to_month(to_interval('12 months'))
----
12

In pr:

select to_month(to_interval('12 months'))
----
0

3. fix date convert timestamp

In main:

set timezone='America/New_York'

select '1990-05-15'::date::timestamp;
----
1990-05-15 01:00:00.000000

In pr:

set timezone='America/New_York';

select '1990-05-15'::date::timestamp;
----
1990-05-15 00:00:00.000000

Fix:
#18108
#18139
#18138

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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