feat: Add ability to test hot-reload scenario

[dr1rrb]

fix: https://github.com/unoplatform/uno.ui.runtimetests.engine/issues/87 fix: https://github.com/unoplatform/uno.ui.runtimetests.engine/issues/102

Feature

Add ability to test hot-reload scenario

What is the current behavior?

• No way to test hot-reload
• Missing lot of helpers to test applications

What is the new behavior?

• Add support for auto-start of external application
• Import helpers from uno and other projects

PR Checklist

• [x] Tested code with current supported SDKs
• [ ] Docs have been added/updated which fit documentation template. (for bug fixes / features)
• [x] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ ] Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• [x] Contains NO breaking changes
• [ ] Updated the Release Notes
• [x] Associated with an issue (GitHub or internal)