Tatsu

* add URLs to `pyproject.toml`
* include `./examples` in source distributions

* use more `ruff` rules
* lint unit tests
* lint examples
* lint the generated parser
* make sure generated parsers and models pass `ruff`

* [exceptions] generators in exceptions break multiprocessing
* [buffering] optimize use of regular expressions

This release adds fixes, enhancements, optimizations, and documentation to the `asjson()` protocol that is used to view ASTs and models.

The bump in the minor version number because the changes to `asjson()` will likely break code that relies on the `__json__()` protocol and thus create a backwards incompatibility.

* [codegen] pass whitespace setting to parser
| * [codegen] restore default Buffer class

Fix errors in the move to `pyproject.toml`