feature(parser): handle when email_validator package is not present for SES model (#998)

Author: Manuel Ochoa

aws_lambda_powertools/utilities/parser/models/ses.py

@@ -1,12 +1,21 @@
+import logging
+import sys
 from datetime import datetime
-from typing import List, Optional
+from typing import List, NewType, Optional
 
 from pydantic import BaseModel, Field
-from pydantic.networks import EmailStr
 from pydantic.types import PositiveInt
 
 from ..types import Literal
 
+has_email_validator = "email_validator" in sys.modules
+
+if has_email_validator:
+    from pydantic.networks import EmailStr
+else:
+    logging.warning("email_validator package is not installed")
+    EmailStr = NewType("EmailStr", str)  # type: ignore[no-redef, misc]
+
 
 class SesReceiptVerdict(BaseModel):
     status: Literal["PASS", "FAIL", "GRAY", "PROCESSING_FAILED"]