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.

Bắt đầu từ ApplicationManifestUtilsV3.read và write, sử dụng manifest và output được cung cấp làm bản tái hiện. Theo dõi cách metadata được biểu diễn trong quá trình round trip đó, giữ lại các nhãn và chú thích được mô tả trong issue, đồng thời xác minh rằng manifest kết quả vẫn giữ chúng.