Metadata manifest attribute not supported

The cloud foundry app manifest supports a metadata attribute for setting labels and annotations: https://docs.cloudfoundry.org/devguide/deploy-apps/manifest-attributes.html#metadata

However, this attribute seems to be ignored by the cf-java-client.

How to reproduce

Here is a minimal example that reproduces the issue:

ManifestV3 manifest = ApplicationManifestUtilsV3.read(Path.of("test-manifest-with-labels.yaml"));
ApplicationManifestUtilsV3.write(Path.of("test-manifest-result.yaml"), manifest);

Content of test-manifest-with-labels.yaml:

---
applications:
- name: test-app
  memory: 1G
  instances: 1
  metadata:
    labels:
      test-label: "test-value"

Content of test-manifest-result.yaml after the snippet above has run:

---
applications:
- name: test-app
  memory: 1G
  instances: 1

As you can see, the metadata information has been removed. When using the cf-java-client to deploy such a manifest, the metadata labels and annotations are therefore discarded. I would expect the attributes mentioned in the cloud foundry documentation to be supported by this client library, including the metadata attribute.

从 ApplicationManifestUtilsV3.read 和 write 开始，使用提供的 manifest 和 output 作为复现材料。跟踪 metadata 在该 round trip 期间的表示方式，保留 issue 中描述的 labels 和 annotations，并验证生成的 manifest 是否保留了它们。