feat: upgrade to Manifest V3

[wowxoxo]

I did based things just to make it works as before.

Summary

• switch extension to manifest version 3
• replace background page with service worker
• remove Google Analytics code
• sync saved sessions to chrome.storage
• update popup and options scripts to work with the new service worker

Tested locally - all things works as expected

P.S. - not sure that old saved sessions will be available after the extension update in Chrome Web Store