Implement expected behavior on toggling SpiceSession::enable-audio
Resubmit MR to remove personal branch from main repository.
Started to play with this after looking into how to fix problem pointed out on !7 This MR allows us to toggle on/off audio using existing SpiceSession::enable-audio API
For !7 we can use this work to disable audio on back end errors.
For a quick test, one can use the toggle option added in spicy in the first commit.