Improve user warnings and logic for update_sdtype

[amontanez24]

Problem Description

As a user, I want to be able to update the sdtype of any column, even if they're involved in a multi-column transformer. If I do so, the config should still be valid..

Expected behavior

update_sdtypes

If you update an sdtype of a column in a multi-column transformer, and the new sdtype is no longer compatible with the transformer then:

1. show a warning
2. REMOVE it from the transformer
3. Choose a new, compatible transformer instead.

# before
>>> ht.get_config()
{
  'sdtypes': {
    'A': 'city',
    'B': 'state',
    'C': 'country'
  },
  'transformers': {
    ('A', 'B', 'C'): address.RandomLocationGenerator()
  }
}

# updating to an incompatible sdtype for the RandomLocationGenerator
>>> ht.update_sdtypes(column_name_to_sdtype={
         'A': 'phone_number',
         'B': 'categorical'
})


Warning: sdtype 'phone_number' is incompatible with transformer 'RandomLocationGenerator'. Assigning a new transformer to it.
Warning: sdtype 'categorical' is incompatible with transformer 'RandomLocationGenerator'. Assigning a new transformer to it.
>>> ht.get_config()
{
  'sdtypes': {
    'A': 'phone_number',
    'B': 'state',
    'C': 'country'
  },
  'transformers': {
    'A': phone_number.AnonymizedGeoExtractor(),
    'B': UniformEncoder()
    ('C'): address.RandomLocationGenerator()
  }
}
# edge case: If there is only column in it, then replace the transformer entirely
>>> ht.get_config()
{
  'sdtypes': {
    'D': 'city',
  },
  'transformers': {
    ('D'): RandomLocationGenerator()
  }
}

# updating to invalid sdtype for the RandomLocationGenerator
>>> ht.update_sdtypes(column_name_to_sdtype={
         'D': 'phone_number'
})
Warning: sdtype 'phone_number' is incompatible with transformer 'RandomLocationGenerator'. Assigning a new transformer to it.


>>> ht.get_config()
{
  'sdtypes': {
    'D': 'phone_number'
  },
  'transformers': {
    'D': phone_number.AnonymizedGeoExtractor()
  }
}