StrixDataRootPlaybackHandlerPlugin should not be public

[Arlo]

Describe the bug

All classes used internally in the PlaybackHandlerPlugin should be marked as internal, but StrixDataRootPlaybackHandlerPlugin is marked as public.

The result is that this type is visible in docs when it doesn't need to be (permalink):

Affected area

• Strix Music SDK
• Strix Music App

Regression

No response

Steps to reproduce

N/a

Visual repro steps

No response

Expected behavior

All classes used internally in the PlaybackHandlerPlugin should be marked as internal

Additional context

No response

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