FastAPI Log notification

This module extends the FastAPI endpoint configuration screen. On the endpoint form, right after the option that enables request logging, two new fields appear (only for users in the API Log group, and only when request logging is turned on):

• an activity type, used to create an activity when an exception is logged;
• an email template, used for the notification related to that exception.

The module itself only adds these configuration fields to the fastapi.endpoint form view; the actual creation of the activity and the sending of the email are handled by the modules it depends on (fastapi_log and api_log_mail). No new menus, reports, scheduled jobs or business rules are defined in this module's code. Its purpose is simply to let you pick, per endpoint, which activity type and which email template should be used when an error is recorded.