[9.x] Trims numeric validation values / parameters

[timacdonald]

With the introduction of brick/math to handle the numeric validation rules, we had a slight regression. Previously values were cast to int or float by PHP. When PHP does this it trims any whitespace.

'\n 5 ' > 5

// same as

5 > 5

brick/math will throw an exception if the value contains whitespace. To restore the previous functionality we are now trimming the value and parameters where suitable.

This regression was raised in #45762 (comment)