chore: generate a code coverage badge

[hanspagel]

With this PR a code coverage report is generated, and a beautiful badge is updated with the code coverage percentage.

[changeset-bot]

⚠️ No Changeset found

Latest commit: ceedc01

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[hanspagel]

No stale PRs 🏄