Support "Near Me" queries

[yen-tt]

Add support for 'Near me' queries in search bar

• added search-operations file that includes util functions for executing search, getting search intents, and user location
• update LocationBias component to retrieve user location and execute search using SearchHandler.
• updated VerticalSearchPage and UniversalSearchPage fetch searchIntents from autocomplete search, in the case of a default initial search with near me intent, get and update user's location if there is a near me intent, and execute query.
• updated searchBar to rely on autocomplete response from latest request to retrieve the search intent, and update user's location before executing a search

Note: there's a noticeable wait time when navigator.geolocation is used. and there isn't any indication that the results maybe in loading state. Should consider exposing a setLoadingStatus in answersHeadless, so it can be use when executeSearchWithUserLocation is triggered.

J=SLAP-1706
TEST=manual

• set location to washington DC in when vertical page is loaded, click update my location from LocationBias component, and see that the label is updated to my device's location.
• set default search query to 'engineers near me' and see that user location is set based on location near my device.
• ran searches between non-nearMe and nearMe queries, see that setUserLocation is only on queries with nearMe intents

[coveralls]

Coverage remained the same at 75.532% when pulling 4f0ea01 on dev/near-me-support into ced7e2c on main.

[cea2aj]

This logic looks correct, however I find it a little difficult to follow since it requires me to go back and forth between the search-operations class to understand it. Would something like this work:

if ( state.location.userLocation ) {
   executeSearch()
} else {
   const intents = getSearchIntents()
   updateLocationIfNeeded(intents)
   executeSearch()
}

[yen-tt]

in both condition, it would still call executeSearch so I think it's better to just extract it out of the if/else and call it once. But I updated the function to be updateLocationIfNeeded as suggested, hopefully that's easier to understand

[cea2aj]

looks good!