Ajout de tests et d'actions pour les filtres Zimbra

src/UnicaenZimbra/Entity/Filter/Action/Discard.php

src/UnicaenZimbra/Entity/Filter/Action/Flag.php

src/UnicaenZimbra/Entity/Filter/Action/Keep.php

src/UnicaenZimbra/Entity/Filter/Action/Redirect.php

src/UnicaenZimbra/Entity/Filter/Action/Tag.php

src/UnicaenZimbra/Entity/Filter/Test/Address.php

src/UnicaenZimbra/Entity/Filter/Test/AddressBook.php

src/UnicaenZimbra/Entity/Filter/Test/Attachment.php

src/UnicaenZimbra/Entity/Filter/Test/Body.php

src/UnicaenZimbra/Entity/Filter/Test/ContactRanking.php

src/UnicaenZimbra/Entity/Filter/Test/Flagged.php

src/UnicaenZimbra/Entity/Filter/Test/Header.php

src/UnicaenZimbra/Entity/Filter/Test/HeaderExists.php

src/UnicaenZimbra/Entity/Filter/Test/Me.php