(VSCode Codewind OpenAPI extension) Support intellisense from generated code

[samskiter]

Description of the enhancement:
It looks like the OpenAPI VSCode extension can generate a server stub or client implementation - it doesn't, however, look like VSCode's intellisense understands the link between the generated code and the definition (openapi definition file) https://github.com/eclipse/codewind-openapi-vscode

Proposed solution:
It would be amazing if the links mentioned could be made such that you can navigate from server to client calls natively in VSCode (and even do refactorings?!)