feat: add built-in envelopes

Author: heitorlessa

aws_lambda_powertools/utilities/validation/envelopes.py

@@ -0,0 +1,8 @@
+"""Built-in envelopes"""
+
+API_GATEWAY_REST = "powertools(body)"
+API_GATEWAY_HTTP = API_GATEWAY_REST
+SQS = "Records[*].body"
+SNS = "Records[0].Sns.Message"
+EVENTBRIDGE = "detail"
+CLOUDWATCH_EVENTS_SCHEDULED = EVENTBRIDGE