feat: add adaptor-fetch package

Provides a generic interface for creating adaptors using the fetch() API

packages/adaptor-fetch/README.md

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+# adaptor-fetch
+
+A generic fetch adaptor for Puck that can be used for most content repositories.
+
+## Quick start
+
+Install the package:
+
+```sh
+npm i @measured/puck-adaptor-fetch
+```
+
+Create an adaptor using the [fetch() API](https://developer.mozilla.org/en-US/docs/Web/API/fetch):
+
+```jsx
+import createAdaptor from "@measured/puck-adaptor-fetch";
+
+const movieAdaptor = createAdaptor("http://localhost:1337/api/movies", {
+  headers: {
+    Authorization: "Bearer abc123",
+  },
+});
+```
+
+Configure your Puck instance. In this case, we add our `movieAdaptor` to the `movie` field on our "MovieBlock" component:
+
+```jsx
+import { Puck } from "@measured/puck";
+
+const config = {
+  components: {
+    MovieBlock: {
+      fields: {
+        movie: {
+          type: "external",
+          adaptor: moviesAdaptor,
+        },
+      },
+      render: ({ movie }) => <h1>{movie.title}</h1>,
+    },
+  },
+};
+
+export function Page() {
+  return <Puck config={config} data={data} />;
+}
+```
+
+## License
+
+MIT © [Measured Co.](https://github.com/measuredco)

packages/adaptor-fetch/index.ts

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+export const createAdaptor = (
+  input: RequestInfo | URL,
+  init?: RequestInit,
+  name: string = "API"
+) => ({
+  name,
+  fetchList: async () => {
+    const res = await fetch(input, init);
+    const body: { data: Record<string, any>[] } = await res.json();
+
+    return body.data;
+  },
+});
+
+export default createAdaptor;

packages/adaptor-fetch/package.json

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+{
+  "name": "@measured/puck-adaptor-fetch",
+  "version": "0.3.2",
+  "private": false,
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "license": "MIT",
+  "scripts": {
+    "lint": "eslint \"**/*.ts*\"",
+    "build": "rm -rf dist && tsup index.ts",
+    "prepare": "yarn build"
+  },
+  "files": [
+    "dist"
+  ],
+  "devDependencies": {
+    "eslint": "^7.32.0",
+    "eslint-config-custom": "*",
+    "tsconfig": "*",
+    "tsup-config": "*",
+    "typescript": "^4.5.2"
+  }
+}

packages/adaptor-fetch/tsconfig.json

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+{
+  "extends": "tsconfig/react-library.json",
+  "include": ["."],
+  "exclude": ["dist", "build", "node_modules"]
+}

packages/adaptor-fetch/tsup.config.ts

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+import { defineConfig } from "tsup";
+import tsupconfig from "../tsup-config";
+
+export default defineConfig(tsupconfig);