Fix how get_config prints transformers

[amontanez24]

Environment Details

Please indicate the following details about the environment in which you found the bug:

• RDT version: v1.0.0
• Python version: Any
• Operating System: Any

Error Description

When the output of the get_config method is printed (as the cell output), the dictionary contains the string representation of the transformer (surrounded by double quotes) instead of the transformer object.

Furthermore, the dictionary with strings is "copy/pasted" into a new dictionary and then passed to the set_config method, it crashes