allow setting spaceBeforeSeparator

Author: fandreuz

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/JsonExtension.java

@@ -194,6 +194,11 @@ public JacksonJsonGradleConfig jsonFeature(String feature, boolean toggle) {
 			return this;
 		}
 
+		public JacksonJsonGradleConfig setSpaceBeforeSeparator(boolean value) {
+			jacksonConfig.setSpaceBeforeSeparator(value);
+			return this;
+		}
+
 		@Override
 		public JacksonJsonGradleConfig self() {
 			return this;