Add base model layout from V2 for frontend

resources/scripts/api/definitions/index.d.ts

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+import { MarkRequired } from 'ts-essentials';
+
+export type UUID = string;
+
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface Model {}
+
+interface ModelWithRelationships extends Model {
+    relationships: Record<string, unknown>;
+}
+
+/**
+ * Allows a model to have optional relationships that are marked as being
+ * present in a given pathway. This allows different API calls to specify the
+ * "completeness" of a response object without having to make every API return
+ * the same information, or every piece of logic do explicit null checking.
+ *
+ * Example:
+ *  >> const user: WithLoaded<User, 'servers'> = {};
+ *  >> // "user.servers" is no longer potentially undefined.
+ */
+type WithLoaded<M extends ModelWithRelationships, R extends keyof M['relationships']> = M & {
+    relationships: MarkRequired<M['relationships'], R>;
+}
+
+/**
+ * Helper type that allows you to infer the type of an object by giving
+ * it the specific API request function with a return type. For example:
+ *
+ * type Egg = InferModel<typeof getEgg>;
+ */
+export type InferModel<T extends (...args: any) => any> = ReturnType<T> extends Promise<infer U> ? U : T;

resources/scripts/api/definitions/user/index.ts

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+export * from './models.d';
+export { default as Transformers, MetaTransformers } from './transformers';

resources/scripts/api/definitions/user/models.d.ts

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+// empty export
+export type _T = string;

resources/scripts/api/definitions/user/transformers.ts

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+export default class Transformers {
+}
+
+export class MetaTransformers {
+}