CSIP Connection state changes not dependent on its broadcasts to be recorded.

Posting the connection change on a handler to make sure that we don't enter a stack overflow. (If connection disconnects we also remove state machine which is a conflict).

Bug: 296932947
Test: atest BluetoothInstrumentationTests
Tag: #refactor
Change-Id: Id4d09f8ccb2bfd3da5ef1138e4e6e7cb36233a80