Added accurateCastOrNull function and type conversions in x IN (subquery) expressions

Why it matters

The accurateCastOrNull function improves type casting accuracy by returning NULL instead of errors when casts fail, enhancing query robustness. Support for type conversions in x IN (subquery) expressions resolves previous limitations, allowing more flexible and reliable comparisons between different data types.

How to use it

Use the function accurateCastOrNull to safely cast values with:

SELECT accurateCastOrNull(value, 'TargetType')

Type conversions in x IN (subquery) expressions are automatically applied, enabling queries like:

SELECT * FROM table WHERE column IN (SELECT another_column FROM other_table)

where implicit conversions handle type mismatches.