Implement native function of weekofyear

[weimingdiit]

Description

Implement Spark-compatible weekofyear() function

Auron already supports several Spark-compatible date/time extraction functions such as
year(), month(), dayofmonth(), dayofweek(), quarter(), hour(), minute(), and second().
However, Spark also provides weekofyear(), which returns the week number of a given date using ISO-style week semantics.

To achieve better compatibility with Spark SQL, we should implement weekofyear() with the following characteristics:

Expected behavior

Function name: weekofyear(expr)

Return type: INT

Week semantics:

• A week starts on Monday
• Week 1 is the first week of the year that contains more than 3 days
• This is consistent with ISO 8601 week numbering

Examples:

• weekofyear('2008-02-20') -> 8
• weekofyear('2009-07-30') -> 31
• weekofyear('2016-01-01') -> 53
• weekofyear('2017-01-01') -> 52

Supports: DATE, TIMESTAMP, and compatible string/date inputs consistent with existing date extraction functions

Additional expectations:

• Null-safe: should return NULL if input is NULL
• Array and scalar inputs: consistent with current native date extraction function implementations
• Cross-year boundary behavior should match Spark semantics exactly

Motivation

• Ensure feature parity with Apache Spark SQL
• Improve compatibility for expressions and queries migrated from Spark
• Reduce fallback occurrences to Spark expression/UDF wrapper
• Provide correct native behavior for ISO week-based calculations, especially around year boundaries