[SB][ComposeIcons] Add interactor for bluetooth connection status

This CL adds an interactor that can be used to determine if
there is currently an active bluetooth connection. This will be
used to determine if a bluetooth connected icon needs to be
shown in the status bar.

Bug: 414890231
Test: BluetoothConnectionStatusInteractorTest
Flag: com.android.systemui.status_bar_system_status_icons_in_compose

Change-Id: Ib4cd694968d2594c4de8678369738669aa4a3090