Description:
Adds a message_status_history table to track the history of messages over time.

• Cleaned up along with outgoing_messages via foreign key
• Alert details page updated to allow viewing full message history

Out of Scope:

• Admin message logs has not been updated to display the new history.
• No metrics are emitted or aggregated for things like time-to-delivery.
• Alert log messages are added when sent but not when initially scheduled, this change makes fixing that a natural improvement, but is not in this PR.

Screenshots:

Describe any introduced user-facing changes:

• Alert logs now have an expansion option for sent notifications

Describe any introduced API changes:
New query for getting the history of a message.