* Add PII Tag and Sensitivity Level enums.
* Add feature-extraction for PII classification tasks
* Add faker as test dependency
* Add unit tests for presidio tag extractor
* Add PIISensitivityTags enum and update sensitivity mapping logic
* Add Presidio utility functions for PII analysis
* Extend column name regexs for PII
* Add colum name split
* Move pii algorithms to dedicated package
* Add tests for PAN, NIF, SSN entities
* Fix linting
* Add comment on why we need to set specific lanaguage to Presidio recognizers, as per PR suggestion.
* Fix version of faker to prevent flaky tests. Fix failing tests.
* Fix wrong import
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Co-authored-by: Pere Menal <pere.menal@getcollate.io>
