feat: to_decimal support more types

[KKould]

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Summary

• fixes: feat: to_decimal support more types #19030

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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This change is 

[Copilot]

Pull request overview

This PR extends the to_decimal function to support non-string input types (Boolean, Number, Decimal, and Variant) in addition to the existing string support. Previously, users had to use explicit type casts or the parameterized syntax to_decimal(precision, scale)(value) to convert numeric types to decimal. Now they can use the more intuitive syntax to_decimal(value, precision, scale).

Key changes:

• Added support for 3-argument to_decimal calls with non-string types (value, precision, scale)
• Implementation handles Boolean, Number (integers and floats), Decimal, and Variant types
• Added comprehensive test cases covering floats, booleans, integers, and the try_to_decimal variant

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/query/functions/src/scalars/decimal/src/cast.rs	Added pattern match case (3, false, false) to handle 3-argument calls with non-string types, enabling to_decimal(value, precision, scale) syntax for numeric types
tests/sqllogictests/suites/base/11_data_type/11_0006_data_type_decimal.test	Added test cases for converting float literals, booleans, integers from numbers() table, and try_to_decimal with integer input

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