**Breaking Changes:**
- Rename the `EntityExtractor` to `NERExtractor`
- Rename the input variable `output_gen` to `sub_variant` in `DateGenerator`
- Rename the input variable `entity_prefix` to `add_entity_attrs` in `LLMLabelGenerator.generate`
- Move the `regex` submodule from `anonipy.anonymize` to `anonipy.utils`
**New Features:**
- Add a pattern extractor named `PatternExtractor`, used to extract entities using spacy pattern matching and regex
- Add a multi extractor named `MultiExtractor`, used to extract entities using multiple extractors
- Add the `DATE_TRANSFORM_VARIANTS` constant to help with date generator
- Refine the `Entity` implementation
- Improve package documentation