feat: change env to map in the front-end model

[Peefy]

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

• N
• Y

• Close Maybe the code or environment variable is an array. If I overwrite it, it will be overwritten as a whole. If it is a dictionary, it will be better to cover it individually. #6

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

• examples/appops/nginx-example/base/base.k
• models/kube/frontend/container/container.k
• models/kube/frontend/container/env/env.k

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
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

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

• 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)
• Manual test (add detailed scripts or steps below)
• Other

[zong-zhe]

LGTM