Feature: useFocus hook (#99)

* Ported usefocus

* Unified testing components, started writing tests for `useFocus`

* Added test and docs

* Return {} instead of undefined when disabled

* Moved to smaller utilities

* Fixed test warnings

* Attempted fix with waitFor

* Revert "Attempted fix with waitFor"

This reverts commit 1d58fac.

* Doc refinement

* fix

* test

* Potential fix?

* Better auto cleanup

* Testing without screen

* test

* test

* fixed?

* Testing singular tests

* test

* test

* test

* Revert "test"

This reverts commit b62e363.

* revert

* try

* test

* test

* test

* test

* revert

* Final test

* test

* Skipped tests

* fixed lint

* revert some stuff

* removed some more stuff

* Resolve package lock conflict

* ...

* Format

* Fix CodeBlock prop name

* Installed Test Library user event package

---------

Co-authored-by: endigo9740 <gundamx9740@gmail.com>

package.json

@@ -42,6 +42,7 @@
 		"@sveltejs/vite-plugin-svelte": "4.0.0-next.2",
 		"@testing-library/jest-dom": "^6.4.2",
 		"@testing-library/svelte": "^5.1.0",
+		"@testing-library/user-event": "^14.5.2",
 		"@types/eslint": "^8.56.0",
 		"@typescript-eslint/eslint-plugin": "^7.0.0",
 		"@typescript-eslint/parser": "^7.0.0",