fix(shared/utils): add better utils for extension URL

[sidvishnoi]

Extracted from #560.

• Better user agent detection, including better support for mobile browser detection
  • On browsers where extension isn't supported, we can customize the handling. Earlier, on Chrome Android, we were asking users to install extension (which they can't), instead of using some fallback.
• Extracted extension related utils to a separate file in shared/utils.
• Add UTM params tracking to extension links, so we know where the installs came from when coming from tools.

[github-actions]

Deployment results

Worker	Alias	URL	Outcome
API	-	8fa96c7c	success
CDN	-	352270c0	success
App	-	fd8c5574	success

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Logs #21982686079