[notification] move notification view in ``sobject.notification`` It has no user outside this module. This enforce serversideness of notification and allow future cleanup. No backward compat is set up to prevent circular import. The class has no other user anyway. (closes 2845144)

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include *.py

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include */*.py

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recursive-include data *.gif *.png *.ico *.css *.js

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recursive-include i18n *.po

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recursive-include wdoc *