support Go API for GetSchemaTypeMapping

[amyXia1994]

Feature Request

Is your feature request related to a problem? Please describe:

We have rest API rpc GetSchemaTypeMapping(GetSchemaTypeMapping_Args) returns(GetSchemaTypeMapping_Result); on kcl-py but the corresponding Go API is missing.

The GetSchemaTypeMapping((file: string, code:string) is required to export HIR of KCL schema, which could be used to integrate other tools, like kcl-doc, vscode-kcl low code create from schema, etc.

Describe the feature you'd like:

add GetSchemaTypeMapping((file: string, code:string) Go API

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: