Developer locations

[joemasilotti]

This PR continues the work I did in my livestream on Tuesday morning. It adds a location field on the developer form.

To-do

• Persist Location as nested attribute on Developer
• Geocode city, state, country via geocoder gem
• Get time zone via timezone gem
• Render location on developer profile
• Render time zone from location
• Add tests for Location
• Add tests for LocationComponent
• Filter by time zone from Location, not Developer
• Backfill for migration time zone from Developer to Location
• Update scheduler in production from developers:utc_offset to locations:utc_offset
• Deploy
• Run backfills:time_zone

Being handled in #302

• Remove developers.time_zone and developers.utc_offset
• Remove conditional validation for locations.latitude and locations.longitude

Pull request checklist

• Your code contains tests relevant for code you modified
• You have linted and tested the project with bin/check