aaudio: add tests for device switch detection and refactor

Add detection for device switch during capture and playback tests:
 write_sine, write_sine_callback, input_monitor, input_monitor_callback

Refactor tests and move simple player, simple recorder and utility
methods in separate header files and folder.

Bug: 33355262
Test: run write_sine and input_monitor tests
Change-Id: Iced66fa4344aecd8a2952e22a98e6e8454f38a5e