Added nr advanced calling settings support

- Added a telephony provider entry for storing the user's settings.
- Added new vonr_enabled_bool config to determine whether VoNR
  should be enalbed for carrier

Bug: 202150953
Bug: 205625979
Test: manual
Change-Id: Ie56a7de3fdb978353af77bafb55b0e37c22b58a4
Merged-In: Ie56a7de3fdb978353af77bafb55b0e37c22b58a4