[DOCS] Add reference for the Audio Animation component

[FiniteStateGit]

Describe the issue briefly

There is no component reference page for the Audio Animation component.

Which page(s) / section(s) are affected?

https://www.o3de.org/docs/user-guide/components/reference/#audio https://www.o3de.org/docs/user-guide/components/reference/audio/ https://www.o3de.org/docs/user-guide/components/reference/audio/audio-animation https://www.o3de.org/docs/user-guide/gems/reference/audio/audio-system/

[chanmosq]

Other Audio component docs may also need an update.