[Feature] JAVA客户端 Traverser API 中 K-neighbor API :顶点 集合属性 过滤不支持 P.contains([\"xxx\"])

### Search before asking

- [x] I had searched in the [feature](https://github.com/apache/incubator-hugegraph-toolchain/issues?q=is%3Aissue+label%3A%22Feature%22) and found no similar feature requirement.

### Feature Description (功能描述)

[Feature] JAVA客户端 Traverser API 中 K-neighbor API :顶点 **集合(set/list)属性** 过滤不支持 **P.contains([\"xxx\"])**,且 集合属性怎么进行精确匹配?

### Are you willing to submit a PR?

- [x] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start at the Java client's Traverser API, specifically K-neighbor vertex-property filtering, and inspect how P.contains(["xxx"]) is currently handled for set and list attributes. Clarify the intended semantics for exact collection matching, then reproduce the unsupported case and define completion around consistent filtering behavior and coverage for the chosen semantics.

Written by the indexing model from the issue text.