Merge branch 'main' into v2

Author: justinyoo

release-notes/v1.5.1.md

@@ -0,0 +1,12 @@
+## Release Notes ##
+
+* Bug fixes and enhancements
+
+
+### Changes & Fixes ###
+
+* #547 Flexibility to choose Microsoft.AspNetcore.App on the isolate worker #536 #534
+* #524 add TimeSpanObjectTypeVisitor #401
+* #506 Fix handling of 'Required' fields for Newtonsoft #402 #336
+* #504 Allow object types to be marked as nullable
+* #503 Fix issue with DocumentHelperExceptions.GetOpenApiParameters not forwarding the OpenAPI schema version