Create an invitations plugin

From https://gitlab.fusiondirectory.org/campus-condorcet/referentiel-des-identites/-/issues/12

It will extend from the public-forms plugins

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@bmortier The file invitations/personal/invitations/class_userRegistration.inc needs packaging

Hello,

done in https://gitlab.fusiondirectory.org/debian/fusiondirectory/issues/5713

Cheers

created branch 5850-create-an-invitations-plugin