feat: update ApplicationBuilder for improved metadata, parameter compatibility, and env handling

[eminaktas]

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

• [x] N
• [ ] Y

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

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

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

• added a new option parameter to set application metadata, enabling metadata specification within the KCLRun file. This addresses a limitation when building with the kcl kubeclt plugin.
• renamed env to appenv and cluster to appcluster to avoid conflicts with system environment variables, especially when using env as a key in options with KCLRun.
• modified ApplicationBuilder to use EnvMap instead of a list of dictionaries for envs, ensuring compatibility with the container env parameter structure.

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

• [ ] N
• [x] 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

[Peefy]

Thank you! LGTM.