[Dialog] materialAlertDialogTheme is not public

[ataulm]

Description:

materialAlertDialogTheme is not explicitly marked as public, though similar theme attributes are in this file and the attribute is meant for public use.

This means that Lint will flag its usage in code:

Expected behavior:

I'd expect the attribute to be marked as public too, since it's used in a similar way to the other attributes, so that Lint doesn't flag it.

Material Library version:
1.1.0-beta02

[ataulm]

Also if this is done, would it make sense to rename this to materialAlertDialogThemeOverlay to match materialThemeOverlay?