feat(python): catch all exceptions thrown through fastapi route paths

This commit does quite a bit:
- Catches unhandled exceptions raised in the route handler and
  produces a 500 Internal Server Error Arch-themed response.
- Each unhandled exception causes a notification to be sent to new
  `notifications.postmaster` email with a "Traceback ID."
- Traceback ID is logged to the server along with the traceback which
  caused the 500: `docker-compose logs fastapi | grep '<traceback_id>'`
- If `options.traceback` is set to `1`, traceback is displayed in
  the new 500.html template.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/user.py

@@ -1,12 +1,11 @@
 import hashlib
 
 from datetime import datetime
-from http import HTTPStatus
 from typing import List, Set
 
 import bcrypt
 
-from fastapi import HTTPException, Request
+from fastapi import Request
 from sqlalchemy import or_
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import backref, relationship
@@ -142,11 +141,7 @@ class User(Base):
                 exc = exc_
 
         if exc:
-            detail = ("Unable to generate a unique session ID in "
-                      f"{tries} iterations.")
-            logger.error(str(exc))
-            raise HTTPException(status_code=HTTPStatus.INTERNAL_SERVER_ERROR,
-                                detail=detail)
+            raise exc
 
         return self.session.SessionID