feat: enhance generation of kcl schema from json 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

In this PR, I make the following changes:

• fix a bug related to enum and const with type.

"category": {
    "type": "string",
    "enum": [
        "A",
        "B"
    ]
}
------
// Before, we will get the following result, which accept all string.
category?: str | "A" | "B"
------
// Now, we will ignore the type for enum and const to get the correct result
category?: "A" | "B"

• improve the naming logic. For the root schema, it may has $id keyword, or title keyword, or neither as they are not required. So now we prefer $id, then title keyword, then name in parameter(for root schema it will be the filename). If neither exists, we will use "MyType" as default.
• handle name conflict. For the keywords in kcl, if it is used as a identifier, we will add $ before it to avoid name conflict.
• Optimize output for unsupported keywords. Previously, unsupported keywords could result in weird results and syntax errors. Now, we will convert it into "any" type to make it still work, although with some loss of information.

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!