fix(framework): base64 encoded response were not being decoded (#137)

## Summary

**_What's changed?_**

- Added support for the `isBase64EncodedResponse` property
- Added example to showcase change
- Bumped version to 1.1.2 to prepare release

**_Why do we need this?_**

- We should support base64 encoded response

**_How have you tested it?_**

- Added a simple unit test ✅ 
- Example is returning a cat picture ✅ 

## Checklist

- [x] I have reviewed this myself
- [x] There is a unit test covering every change in this PR
- [x] I have updated the relevant documentation

## Details

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 <!-- The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). -->
 
+## v1.1.2
+
+### Fixed
+
+- Added support for `isBase64Encoded` in response
+
 ## v0.1.0
 
 ### Added

examples/base64/handler.js

@@ -0,0 +1,26 @@
+import { pathToFileURL } from "url";
+
+// Using the "isBase64Encoded" property in the response object, you can return a base64 encoded image
+// The object will be automatically converted back to binary by the runtime.
+async function handler(event, context, callback) {
+  const resp = await fetch("https://http.cat/images/200.jpg");
+
+  const buf = await resp.arrayBuffer();
+  const b64Cat = Buffer.from(buf).toString("base64");
+
+  return {
+    statusCode: 200,
+    body: b64Cat,
+    isBase64Encoded: true,
+    headers: {
+      "Content-Type": "image/jpeg",
+    },
+  };
+}
+
+// This will execute when testing locally, but not when the function is launched
+if (import.meta.url === pathToFileURL(process.argv[1]).href) {
+  import("@scaleway/serverless-functions").then(scw_fnc_node => {
+    scw_fnc_node.serveHandler(handler, 8080);
+  });
+}