Tile loading performance measurement

[osana]

This PR is based on OkHttp Network Interceptor and the available support in Android Maps SDK for Performance measurement TelementryDefinition, PerformanceEvent

The following measurements are collected:
attributes:

• requestUrl (without token)
• responseCode
• connectionState (none, cellular, wifi)

counters:

• elapsedMS (number in ms)

device metadata:

• os : android
• manufacturer
• brand
• version : (as reported by Build.VERSION.RELEASE)
• abi
• country : (ISO3 country format)
• ram
• screenSize : {width, height}

[osana]

Output showing that events are posted to staging (using metadata from Android maps sdk Test app)

[osana]

Next on my list to verify that posting to production works. Unfortunately, at the moment I am not seeing TelemetryClient output (in case of production endpoint ) due to mapbox/mapbox-gl-native#14376, which is actually because of
mapbox/mapbox-events-android#382

I will try to run against custom .aar of gl-native that will show the response code from the TelemetryClient

[osana]

I tried running against custom .aar with little success so I thought it is not worth spending more time on this. Staging is confirmed to work all the way to Mode.
Production is hard to track due to no logging from telemetry due to a bug mapbox/mapbox-events-android#382
Having the logging output would simplify catching the event in Mode (for example using sessionId).

[tobrun]

Looks good but we need to update to 7.4.0 final before merging

[zugaldia]

@osana what are the next steps to get this PR merged?

[tobrun]

@osana what are the next steps to get this PR merged?

releasing 7.4.0 and updating the maps dependency to it.

[osana]

Added connectivity state to attributes.
"wifiOn" will be set to true or false depending on connectivity

Running against pinned Maps sdk 7.4.0-20190508.212927-142 (that has telemetry listener set )

[tobrun]

7.4.0 got released 🎉