tinarsky

[java] Support for recursive merge of additional spec parameters

1

Method [setAdditionalSpecParameters](https://github.com/ytsaurus/ytsaurus/blob/4e8c37adc59422ab4e6977fd094b669f93e9c83a/yt/java/ytsaurus-client/src/main/java/tech/ytsaurus/client/operations/UserOperationSpecBase.java#L229) can only patch top-level spec fields. It would be convenient if it could also patch spec fields recursively.