[Feature] Add new callbacks to AppDelegate

[sharadb-amazon]

Feature description

AppDelegate should support callbacks for the following events:

1. OnCommissioningSessionEstablishmentError - helps a client (commissionee) know if the PASE session establishment is failing and provide feedback to the user on the UX (say if the wrong passcode was provided)
2. Every CASE session start, close and defunct - this can be used for analytics, error counters, and recording of peers, for instance
3. Every sub start/fail with path iterator - this can be used for analytics, error counters, and recording of peers, for instance
4. A forwarding of fabric add/remove to avoid registering a FabricTable::Delegate elsewhere (because AppDelegate is more centralized than the many inner delegates)

Platform

all

Platform Version(s)

No response

Anything else?

No response