aaudio: prevent stop/close from a callback

Detect whether AAudioStream_requestStop() is being called
from a data or error callback and return error.
Also for start(), pause(), flush() and close().

Honor AAUDIO_CALLBACK_RESULT_STOP in Legacy callback.

Bug: 65560631
Bug: 62943389
Bug: 63096718
Test: test_various.cpp callback_blocker_none and callback_blocker_lowlat
Change-Id: I29a685cd42910f70d16e23db0f9ec00b72451cfc