[BlueBream] Proposition for zope.annotation

[Taras]

I did not find any other place to write this.
zope.annotation provides some good functionality and interfaces. Why does it still have a dependancy on ZODB?
The only place for that is in attribute.AttributeAnnotations. Why is there a direct import? 
Why not request a factory, registered on a name, like `zone.annotation.AttributeAnnotationFactory` and provide it by default if the module ZODB is provided?
I can do the patch if you don't see an issue with it.
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