add render support for kubevela application

[liu-hm19]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• [ ] N
• [x] Y

Ref: #87

2. What is the scope of this PR (e.g. component or file name):

modified: base/pkg/kusion_models/kube/frontend/server.k base/pkg/kusion_models/kube/render/render.k

added: appops/wordpress-kubevela

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [x] Contains experimental features
• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [ ] Other

A new item "renderType" is added in server frontend to support rendering KubeVela Application, and a related wordpress example is given.

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• [x] N
• [ ] Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• [ ] Unit test
• [ ] Integration test
• [ ] Benchmark (add benchmark stats below)
• [x] Manual test (add detailed scripts or steps below)
• [ ] Other

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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[liu-hm19]

I have read the CLA Document and I hereby sign the CLA