Keep contextual card dismissal info upon deletion

Add a config for contextual dismissal. This config is used to
determine whether the existing dismissal timestamp should be
kept before an insertion.

The new dismissal behaviour design replaces the boolean
value(isDismissed) with a long value(dismissedTimestamp) to give
this behaviour more flexibility. Utilizing the timestamp allows
developers to define new criteria of card's display (e.g cards being
dismissed can be shown again after a period of time).

While newly inserted data from SettingsIntelligence or other clients
may not have dismissal timestamp recorded. Turning on the config gives
the capability to persist dismissal timestamp, and more customized
behaviour can be created.

Bug: 143055685
Test: robotests
Change-Id: I9d095955e9c51f2aa3332d49ee230d3ded9ae744