TypeScript Codegen

[NathanFlurry]

• Use the models generated by OpenAPI, generate our own routes/endpoints
  • We already have an OpenAPI generator working
  • We already generate an openapi.json, not sure if we should keep that or not
• Override files in OpenAPI: https://github.com/OpenAPITools/openapi-generator/blob/master/docs/customization.md
• More info: https://www.notion.so/rivet-gg/OpenGB-SDK-Gen-6ae256f578504241ba2c77aa8225f3a2
• Codegen framework needs to support multiple targets to make it easy to adapt for Unity, Godot, Rust, and Unreal in the future
• Only generate public types
• Keep the codegen as simple as possible

Resulting API should look very similar to our ctx, like:

import Backend from "path/to/backend";
let backend = new Backend({ endpoint: "https://abc.opengb.rivet.gg" });  // endpoint is required
await backend.modules.users.create({
  // Request body
});

Should use vanilla fetch API under the hood with a custom error type