Add pre-commit

[ndmlny-qs]

This commit does not run pre-commit on the repo, it just adds it as a dev dependency, and adds the following checks.

• prevents commits to the main branch
• remove unused imports from python files
• modifies all imports to be absolute for python files
• removes commented out code in python files
• runs isort on imports for python files
• runs black on python files (formatting)
• runs ruff on python files (linting)
• fixes for the setup.cfg file
• ensures json, yaml, and toml files are parseable (ignores the conda.recipe/meta.yaml file)
• uses local installs of eslint and prettier for linting and formatting any [java|type]script files.

Also, three additional files have been added.

• ipywidgets_bokeh/.eslintrc.js
• ipywidgets_bokeh/.prettierrc

These files contain the formatting and linting rules as outlined in Bokeh.

The last file is a project.toml file that for the time being only contains preferences for ruff. In the future we can use it for complying with setuptools installs.

The package*.json files have also been modified to include eslint and prettier, as well as updating the lint script from a TODO to an actual linting action. This helps with the requests in #75

Resolves #80

[philippjfr]

Happy to see this merged!