[Large screen] Make slice deep linking to Settings show in 2-pane

- add a standalone home activity for slice deep link.
- add EXTRA_IS_FROM_SLICE to control the slice deep link flow.
- Intent#parseUri fails if the intent data schema is set.
  Add EXTRA_SETTINGS_LARGE_SCREEN_DEEP_LINK_INTENT_DATA to relay the
  data schema.

Bug: 201397123
Test: manual, robotest
      1.  Say 'Enable NFC'/'Enable Bluetooth'to Google assistant.
      2.  Click the the NFC/BT Slice.
Change-Id: Ia3216956328c32b2109cb2d70ad1105327661f26