Add enum name mapping to Java generators #1311

Job	Run time
Gradle tests (samples/openapi3/client/extensions/x-auth-id-alias/java/jersey2-java8)	1m 24s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8-special-characters)	2m 45s
Gradle tests (samples/openapi3/client/petstore/java/jersey2-java8)	55s
Gradle tests (samples/client/petstore/java/jersey2-java8-localdatetime)	1m 24s
Gradle tests (samples/client/petstore/java/jersey2-java8)	58s
Gradle tests (samples/client/petstore/java/okhttp-gson)	57s
Gradle tests (samples/client/petstore/java/okhttp-gson-group-parameter)	1m 22s
Gradle tests (samples/client/petstore/java/webclient-swagger2)	1m 12s
	10m 57s

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