AAudio: add locks around reading and writing

[robertwu1]

This PR fixes an issue where AAudio segfaults if the stream is closed while read or write occurs. The main work done here is a 2 line change adding shared locks for read and write. This is relatively safe as these locks are only used as exclusive for close(), which should wait for all operations to finish in the first place.

I've updated a few things related to unit tests.

1. The unit tests to use a newer version of gradle.
2. I added tests to account to test the new AAudio shared read/write locks.
3. Unit tests wouldn't run for devices built with hardware sanitizer, so I've added a check.

Fixes #1484

[philburk]

Nice!

[robertwu1]

Thanks for the comments! I addressed all of them.