Add in-app notifications for moderation actions/warnings

[ClearlyClaire]

Corresponding notifications were already sent by mail but users sometimes overlook emails and miss moderation warnings.

API

This adds a moderation_warning notification type with a moderation_warning attribute.

These notifications have the recipient as from_account (like for lost relationships) and are never filtered.

The moderation_warning attribute is a new entity AccountWarning with the following attributes:

• id: String
• action: String, one of none (warning only), disable (account has been disabled), mark_statuses_as_sensitive (specific statuses have been marked as sensitive), delete_statuses (specific statuses have been removed), sensitive (the account as a whole has been marked as sensitive content), silence (the account has been limited), suspend (the account has been suspended)
• target_account: the Account who received the warning (always the current user in this context)
• appeal: Appeal entity, optional
• status_ids: Array of String, the identifier of the (possibly deleted) statuses

The new Appeal entity has the following attributes:

• text: String, the text from the current user appealing the moderation action
• state: String, one of approved, rejected or pending

TODO

• improve tests
• add documentation

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Fixes MAS-218

[renchap]

This will need a docs update I think

[kmycode]

The from_account property in REST::NotificationSerializer notifies the target user of the account of the moderator who made the warning, is this the intended specification?

[ClearlyClaire]

The from_account property in REST::NotificationSerializer notifies the target user of the account of the moderator who made the warning, is this the intended specification?

No, it's supposed to be set to the recipient's account, as described in the post:

These notifications have the recipient as from_account (like for lost relationships) and are never filtered.

But double-checking the code, you are right and it is not what actually happens. Going to address that.