rename AsyncPayloadRecord to IncrementalDataRecord

Replicates graphql/graphql-js@b5813f0

Author: Cito

docs/conf.py

@@ -168,7 +168,7 @@
 graphql.execution.execute.DeferredFragmentRecord
 graphql.execution.execute.ExperimentalIncrementalExecutionResults
 graphql.execution.execute.StreamArguments
-graphql.execution.execute.StreamRecord
+graphql.execution.execute.StreamItemsRecord
 graphql.language.lexer.EscapeSequence
 graphql.language.visitor.EnterLeaveVisitor
 graphql.type.definition.TContext