[IMP] l10n_es_aeat: Add chatter + activities to AEAT models
[IMP] l10n_es_aeat: Add chatter + activities to AEAT models

* Include chatter (mail.thread)
* Include activities (mail.activity.mixin)
* Track AEAT report state change
* Include new admin user in AEAT group by default

OCA/l10n-spain,OCA/l10n-spain,OCA/l10n-spain