feat: upload module (#486)

* feat: wip upload module

* feat: local storage and serve local images

* feat: protect against injections

* feat: server local and s3 files

* fix: use storage location when serving local files

* feat: cross field env validation

server/src/utils/stream-to-buffer.ts

@@ -0,0 +1,11 @@
+import { Readable } from 'stream';
+
+export async function streamToBuffer(stream: Readable): Promise<Buffer> {
+  const chunks: any[] = [];
+
+  for await (const chunk of stream) {
+    chunks.push(chunk);
+  }
+
+  return Buffer.concat(chunks);
+}