Add parameter to AnonymizedFaker() and RegexGenerator() to generate only unique values

[npatki]

Problem Description

To effectively use AnonymizedFaker and RegexGenerator on data such as primary keys, I need to ensure that the anonymized data created during the reverse_transform stage is unique.

Expected behavior

Parameters
Add parameter enforce_uniqueness that controls whether the data should be unique.

• (default) False: No guarantees that the anonymized data is unique
• True: Guarantee that the anonymized data will be unique

Functionality
If enforce_uniqueness=True then:

• During reverse_transform: Ensure that the new, anonymized data is all unique. If it isn't possible to create the requested number of rows, then raise an error

Error: The Faker function you specified is not able to generate 1000 unique values. Please use a different Faker function for column ('user_id').

Error: The regex is not able to generate 1000 unique values. Please use a different regex for column ('user_id').

Backwards Compatibility

This change is backwards compatible.

The enforce_uniqueness parameter is optional and assumed to be False if it's not provided. This is the current functionality.