Adding Material Icons as an @import to the build using injectStyles

[GomezIvann]

Checklist

• The build process is done without errors. All tests pass in the /lib directory.
• Self-reviewed the code before submitting.
• Meets accessibility standards.
• Added/updated documentation to /website as needed.
• Added/updated tests as needed.

Description
Using the injectStyles flag of tsup, we can add CSS styles to the Halstack build. I took advantage of that to import the Material Icons into our build, so that our components can have them by default, without needing to use HalstackProvider. This is an improvement on the current approach.