Support query of IMS registrations status and transport type

Also add better logging to tag IMS by slot ID and fix a race
condition in GTS testing where a CarrierConfig change would cause
the test override in ImsResolver to be removed.

Bug: 122098288
Test: atest FrameworksTelephonyTests, atest GtsTelephonyTestCases
Change-Id: Ief3c75613bd889bad3b811fec0372422a6abf586