Add optional parameter for request body (#16972) #47

Job	Run time
Gradle tests (samples/openapi3/client/extensions/x-auth-id-alias/java/jersey2-java8)	58s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8-special-characters)	59s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8)	1m 14s
Gradle tests (samples/client/petstore/java/jersey2-java8-localdatetime)	1m 9s
Gradle tests (samples/client/petstore/java/jersey2-java8)	1m 10s
Gradle tests (samples/client/petstore/java/okhttp-gson)	58s
Gradle tests (samples/client/petstore/java/okhttp-gson-group-parameter)	53s
Gradle tests (samples/client/petstore/java/webclient-swagger2)	1m 19s
	8m 40s

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