Kairyou

Better error handling for attempting to run Kairyou without spacy's ja model installed.

Proper testing and better exception handling.

Move to proper version python 3.10

What's Changed
* Proper testing and 3.10 move by Bikatr7 in https://github.com/Bikatr7/Kairyou/pull/2
* Documentation update and exception standardization by Bikatr7 in https://github.com/Bikatr7/Kairyou/pull/3


**Full Changelog**: https://github.com/Bikatr7/Kairyou/compare/v1.5.0...v1.6.0

Switched License to LGPL to allow for easier usage in other projects.

Kairyou Patch Notes - Minor Update

Enhancements:

Added a base exception class, KairyouException, for better error handling.
Exposed all internal exceptions for clarity and debugging ease.

Bug Fixes:

Resolved an issue where JSON strings were incorrectly allowed during indexing.
Improved internal API to follow PEP standards, ensuring private functions and variables are properly marked.

Please update to the latest version for an improved experience.

Fixed typo in function name, changed internal function naming convention.