Allow parsing +inf for floating point types

Why it matters

This feature addresses the limitation where the string +inf was previously not recognized as a valid input for floating point columns. By allowing +inf to be parsed, it improves compatibility with data sources and standards that represent positive infinity explicitly with a plus sign, enhancing data import flexibility and correctness.

How to use it

Users can now use +inf directly in input data or queries when inserting or importing floating point values. No additional configuration is required, as this support is enabled by default in the parsing logic.