Stop PCM streams before attempting to close them

In order to break out from a data wait loop in the driver
the stream state must be changed from "running". This is
achieved by calling `pcm_stop` from the stream thread.

Added a dedicated "I/O" thread to 'StreamAlsa' to be able
to call `pcm_stop` while an I/O operation is running. The
"I/O" thread is connected to the worker thread by means
of a 'MonoPipe'.

Bug: 364960013
Test: atest CtsMediaAudioTestCases
Test: atest VtsHalAudioCoreTargetTest
Change-Id: Ibb020d25f42df54baf46a37b50577cce294dc053