feat: generate kcl schema from terraform provider schema

[jakezhu9]

1. Does this PR affect any open issues?(Y/N) and add issue references:

• N
• Y

part of kcl-lang/kcl#526

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

pkg/tools/gen

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

Add the feature to generate kcl schema from terraform provider schema. We can use the command terraform providers schema -json > provider.json to get detailed schemas for the providers used in the current terraform configuration . And use GenKcl function to generate kcl schema. The result covers all resource schemas in the file, similar to the base.pkg.kusion_clouds.alicloud and base.pkg.kusion_clouds.aws in konfig.

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

[Peefy]

Good Job! LGTM!