Create formatter

[amontanez24]

Problem Description

As a user, it would be great if synthesized data matched the same numerical format (decimal places) as the fitted data.

The constraints have their reverse_transform after the HyperTransformer and sometimes ruin the formatting. As opposed to adding this formatting check in every constraint, we can pull out this logic into formatting classes that the DataProcessor can use.

Expected behavior

• Create a NumericalFormatter class
• Add a learn_format method that learns the required information from a column.
• Add a format_data method that applies the learned format to a passed in column.

Additional context

• We can decide whether to use this class in the constraints or at a higher level
• The learn_format method can basically copy these lines from the FloatFormatter.fit
  https://github.com/sdv-dev/RDT/blob/8d2894ce30635902ccbb5bc9b1e8bc60f388db78/rdt/transformers/numerical.py#L156-L163
• The format_data method can basically copy these lines from the FloatFormatter.reverse_transform
  https://github.com/sdv-dev/RDT/blob/master/rdt/transformers/numerical.py#L204-L217