Pywordsegment

This is a major release with many changes.
- The main algorithm has been changed according to [instant-segment](https://instantdomainsearch.com/engineering/instant-word-segmentation-with-rust) research. The library is approximately 15 times faster now thanks to their research.
- The unigrams and bigrams dictionaries have been updated with Google's latest version (v3). [Google Ngram V3](https://storage.googleapis.com/books/ngrams/books/datasetsv3.html)
- Dropped Python 3.6 support
- Added Python 3.10 support
- Updated Pyo3 version to v0.14.5

- hardcoded rust dependencies versions

- WordSegmenter is now a static class with static methods. There is no more need to instantiating a new instance to use `segment` methods

- added support in Python 3.9
- unigrams and bigrams files are now compressed and pickled to load
faster and to save some space

- added pypi homepage reference

Initial release