feat(notifications): add escalation notification system

[ajohnson21-uf]

• Add EscalationService to send email alerts when a monitor has been down longer than a configured threshold (escalationMinutes)
• Wire EscalationService into the DI container and SuperSimpleQueueHelper
• Fix statusService to not prematurely reset hasEscalated on recovery, allowing escalation recovery emails to send correctly
• Add escalationMinutes and escalationNotificationIds fields to Monitor model, types, validation, and repository mapping
• Add frontend UI in CreateMonitor for configuring escalation channels and timeout, with form persistence on reload

Describe your changes

Code allows for the user to set a new monitor box called escalation notification that sends a new notification based on time sense a tracked item has gone down. The use case is so people who need to know only of long term failures are notified at the correct time.

Briefly describe the changes you made and their purpose.

Write your issue number after "Fixes "

Fixes #123

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