Add OneHotEncoding CAG pattern

[frances-h]

Problem Description

As we've built up our multi-table CAG patterns, we'd like to convert our each of our existing single table constraints to use the new CAG framework.

Expected behavior

Add the OneHotEncoding CAG pattern. This CAG should inherit from the base CAG class. This CAG should copy the functionality of the existing constraint, much of _fit, _transform, and _reverse_transform should be able to be directly copied without significant logical rewrites.

Args
column_name (str or list[str]): Same as the constraint
table_name (str, optional): The name of the table to apply the CAG pattern to.

Expected Functionality

_validate_pattern_with_metadata

• If no table_name is provided, the metadata must only contain a single table (this should be considered the target table)
• Validate that the columns in column_names exist in the table in the metadata.

_validate_pattern_with_data

• Validate that the data matches a one hot encoding scheme.

_get_updated_metadata

• Return the original metadata

_fit

• Same logic as the constraint (do nothing)

_is_valid

• Same logic as the constraint

_transform

• Same logic as the constraint (do nothing)

_reverse_transform

• Same logic as the constraint

Additional context

• This should be merged to the feature/single-table-CAG feature branch