feat: Added vitest-browser-lit to vitest init browser and docs

[EskiMojo14]

Description

As discussed in #7696, I've made a package for rendering Lit components in Vitest Browser mode.

This PR updates the docs and vitest init browser to include this as an option.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
  • Doesn't seem to be tests for the creator command line - if I just missed it let me know
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

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commit: b31b4da