Adjust logging level for failed OkHttp requests

[zugaldia]

Currently, all failed OkHttp requests are logged as a warning:

 Log.w(LOG_TAG, String.format("[HTTP] Request could not be executed: %s", e.getMessage()));

This doesn't make sense, for example, when the device is not connected to the network (offline mode) and the NoRouteToHostException is expected. Instead, I suggest we log according to the levels defined in the HTTPRequest class (CONNECTION_ERROR, TEMPORARY_ERROR, PERMANENT_ERROR). Something like:

if (type == PERMANENT_ERROR) {
    Log.w(...);
} else if (type == TEMPORARY_ERROR) {
    Log.i(...);
} else if (type == CONNECTION_ERROR) {
    Log.d(...);
}

Thoughts @mapbox/android ?