Wordseg

Added
- Added support for Python 3.11.

Removed
- Dropped support for Python 3.7.

Changed
- Sped up prediction.

Added
- `LongestStringMatching`: Add basic test
- Added Python 3.10 support.

Changed
- `LongestStringMatching`: Reduce memory use by not storing words
of length 1 in training.
- Switched to the top-level `src/` and `tests/` package structure

Deprecated
Removed
- Dropped Python 3.6 support.

Fixed
Security

Added
- Added support for Python 3.9.

First release, starting with two basic models:
`RandomSegmenter` and `LongestStringMatching`.