Integrate feature-session-bundling component

[pocmo]

This component takes care of:

• Restoring the (SessionManager) state from the last active bundle
• Auto-saving the state in certain situations (time interval, when the app goes to the background, when the SessionManager and Session states change)
• Allowing the app to get, remove, create bundles in order to build UI for that.

Note that: Bundle is the name we internally in Android Components. The mocks talk about "Sessions" but this name is already overloaded in our code (-> A Session is a single tab).

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