Floss: Provide scanner_id for OnAdvertisementFound/Lost

An AdvertisementFound/Lost event from MSFT-based LE Scan is tied to a
specific scanner_id instead of for all scanners. This modifies the
IScannerCallback methods to also provide scanner_id as a parameter for
OnAdvertisementFound/Lost so that the client can know which event is for
which scanner.

Bug: 268682529
Tag: #floss
Test: Build Floss on Linux/Chrome OS

Change-Id: I495946c477644701d98d640926edfcec9de4e069