[Autofill] Track FillEventHistory per Session

FillEventHistory are tracked per Session now instead of a singleton

Fixes: 370059095
Flag: android.service.autofill.multiple_fill_history
Test: atest CtsAutoFillServiceTestCases

Change-Id: I921b8e17c71d497fc66b3b47d23ce703990d6908
3 files changed