add enum name mapping to java generators #1309

Job	Run time
Gradle tests (samples/openapi3/client/extensions/x-auth-id-alias/java/jersey2-java8)	1m 15s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8-special-characters)	57s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8)	1m 9s
Gradle tests (samples/client/petstore/java/jersey2-java8-localdatetime)	1m 8s
Gradle tests (samples/client/petstore/java/jersey2-java8)	55s
Gradle tests (samples/client/petstore/java/okhttp-gson)	56s
Gradle tests (samples/client/petstore/java/okhttp-gson-group-parameter)	55s
Gradle tests (samples/client/petstore/java/webclient-swagger2)	1m 13s
	8m 28s

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