Add dependency framework, build process, tests, and other reworks

[swilliams-northpointkc]

Hello,

We at NorthPoint Development recent forked this project for use in an internal project, as we needed a good library for rendering vector tiles to our Google Maps application. During the implementation we made a number of changes we'd like to share in this PR.

At a high level:

• Changes the project architecture to use ES6 modules, add npm for dependency management, and import the pbf and @mapbox/vector-tile dependencies.
• Adds jest for unit testing and adds a number of unit tests to avoid regressions in MVTFeature, MVTLayer, and MVTSource.
• Adds ESLint for code linting, along with standard config.
• Adds a new build process leveraging vite: relevant code and packages are minified and written to vector-tiles-google-maps/dist when npm run build is executed.
• Adds JSDoc types and extended documentation.
• Adds logic to load the Google Maps API key from local storage instead of hardcoding to each example page, and shortcuts to all examples from index.html.
• Removes some Visual Studio boilerplate files that were not being used.

We would be happy to answer any questions you have about these changes!