Raise basic metrics automatically

[abose]

The following basic metrics must be emitted automatically

Platform

Do not bring in third party dependencies. see phoenix code for simpler impl.

• os
• os versions
• browser
• browser versions
• mobile/tablet/pc/other form factor
• OS language
• browser language
• dark/light mode
• accessibility

[abose]

Some metrics like user-agent string need not be emitted manually and can be deduced at the server from the request header for each request.