Description

• Improves vite build time when using watch mode ~1s
• Avoid watch script getting stucked while rebuilding by separating secondary tasks and plugins from the main devtools task
• Unifies all extension build configuration in one file (only one npm task needed)

Testing Instructions

1. Pull and checkout the branch improvement/vite-watch
2. Run the extension: npm run start
3. Open Privacy Sandbox tab on DevTools
4. Observe the extension works correctly as in develop branch
5. Make any change in the extension code
6. Observer the extension is re-built and the process don't get stuck at any moment

Additional Information:

There is a rare cases when the build gets stuck immediately after starting to watch for changes, it only happened once to me and after restarting it worked fine.

Checklist

• I have thoroughly tested this code to the best of my abilities.
• I have reviewed the code myself before requesting a review.
• NA This code is covered by unit tests to verify that it works as intended.
• The QA of this PR is done by a member of the QA team (to be checked by QA).