feat: iam dependencies

IAM endpoints now use dependencies to perform most initial database get requests.

Issue #6

src/iam/exceptions.py

@@ -1,7 +1,28 @@
 """
-Module specific exceptions for <this module>
+Module specific exceptions for the IAM module
 
 Exceptions:
  - List: Description
  - Exceptions: Description
-"""
+"""
+from typing import Optional
+
+from fastapi import HTTPException, status
+
+
+class GroupNotFoundException(HTTPException):
+	def __init__(self, group_id: Optional[int] = None) -> None:
+		detail = "Group not found" if group_id is None else f"User with ID '{group_id}' was not found."
+		super().__init__(
+			status_code=status.HTTP_404_NOT_FOUND,
+			detail=detail,
+		)
+
+
+class PermNotFoundException(HTTPException):
+	def __init__(self, perm_id: Optional[int] = None) -> None:
+		detail = "Permission not found" if perm_id is None else f"User with ID '{perm_id}' was not found."
+		super().__init__(
+			status_code=status.HTTP_404_NOT_FOUND,
+			detail=detail,
+		)