Update self-managed CS logging and telecom test app.

Updating telecom test app to support:
- Focus gained and lost.
- Holdable calls.

These updates help test the new SMCS apis and call swapping functionality.

Updated telecom logging to make it more clear why things are happening:
- Add overloads of hold/unhold methods that allow specifying a reason for
the operation.  This lets us make the telecom dumpsys more clear by
indicating why something was held/unheld.
- Add disconnect overload which allows specifying reason for disconnect.

Bug: 75303815
Test: Manual
Change-Id: I1717d68d07b71d74bcf3be3cd2ac310bd3cd62b4