Change Easy Connect intent naming

1. From ACTION_PROCESS_WIFI_EASY_CONNECT_QR_CODE to ACTION_PROCESS_WIFI_EASY_CONNECT_URI
2. Remove EXTRA_QR_CODE and use data Uri to specify Easy Connect bootstrapping information string

Bug: 125874365
Test: atest AvailableIntentsTest
      WifiDppChooseSavedWifiNetworkFragmentTest
      WifiDppConfiguratorActivityTest
      WifiNetworkListFragmentTest

Change-Id: I706513520daa10197a27f596fa08ca58980205d8