Audio stream synchronized refactoring and prevent stream sync from stopping when set

[adriano-sudario]

I opened PR #100534 a while ago, but messed up after a rebase, so setted it as draft to be removed, but the description still applies to this one.

I think this PR still needs some discussion, but I believe it's important to take a look at that so AudioStreamSynchronized doesn't become a forgotten feature with no maintenance. Same applies to AudioStreamInteractive (to be discussed later), which I believe also needs some refactoring, but this PR doesn't cover nothing on that regard.

Besides the changes on the previous PR, this one also adds unit tests to make sure the refactoring didnt break anything.

Here's some points that needs to be addressed on the discussion:

• Had to make some minor changes on audio_stream_wav after some behaviors caught up while writing the tests
  • has_loop method was not implemented
  • make sure offset is set to zero after begin_resample on start() if p_from_pos is zero, because it was starting with a few milliseconds ahead
• Added get_sync_stream_playback method and exposed it for accessing each AudioStreamPlayback, so it can have more flexibility if someone needs to manipulate it manually. This one needs further discussion, but I believe it increases possibilities with AudioStreamSynchronized and gives more freedom to user. Maybe it can be left to another PR, but it'd have to refactor the tests if we decide to remove it.
• The build pipeline it's breaking only on Linux, pointing some memory leak on test cases which checks playbacks behaviors. I still don't understand if it's a Linux only related problem or if windows and mac's pipeline build just doesn't detect the leaking. If detach_stream_sync is not called after test cases, the leaks are also caught as warning when running local. If some one can help with that, would be much appreciated.

That's it for this PR, please be welcome on joining discussion or just let me know if it doesn't make sense.

• Production edit: This closes AudioStreamSynchronized stops playback if 'set_sync_stream' is called while playing #101400.