Update account visibility API.

Remove no longer used functions and in-memory visibility table.
Add stubs for new methods.
Actual implementation will be added in follow up CLs.
Bug: https://b.corp.google.com/issues/33046496
Test: manual tests, cts tests.

Change-Id: I990759b20c57df70bc944e27b84e59b9f77b9bd4
3 files changed