Change createUser API in UserManager to create a user with seed account data.

Add createUserWithAttributes method to UserManagerService.
Refactor createUser API in UserManager to call createUserWithAttributes in UserManagerService.
Add someUserHasSeedAccountOrAccount method to UserManager system API.
Did some refactoring on UserManagerService to prevent permission check chaining.

Bug: 204560945
Bug: 205100630
Test: atest UserManagerTest (cts)
Change-Id: I137ddcddba2ad422f74231fe37d3d2469b4562fc