Fuzzy-search

- Add a vocabulary to allow setting distractor pairs for common text terms matching phrase terms, to do early pruning of pairs of text tokens and phrase tokens.
- Switch to using `python-levelshtein` for faster Levenshtein computation and early stopping.
- Add an option to pad text and phrase tokens with boundary characters (``) to increase matches when one of the beginning or ending characters matches, or for very short words (shorter than ngram size).

**Full Changelog**: https://github.com/marijnkoolen/fuzzy-search/compare/v2.3.0...v2.4.0

What's Changed
* Update `FuzzyTokenSearcher` to be more exhaustive by marijnkoolen in https://github.com/marijnkoolen/fuzzy-search/pull/1

**Full Changelog**: https://github.com/marijnkoolen/fuzzy-search/compare/1.4.3...v2.3.0

Various bug fixes.

This release adds fuzzy search templates and template searching, as well as numerous bug fixes and improved documentation.

This release contains a complete rewrite of the fuzzy search code, with a cleaner API, proper documentation and unit tests.

This is the first release with the basic fuzzy string searching functionality in place.