Rewrite node-fetch to follow the fetch spec and use ReadableStreams from whatwg-streams instead of node.js streams.

This also removes some features designed for older node.js environments, such as custom promise polyfillis. Additionally it introduces a dependency on whatwg-streams (which is actually good, even though node.js may one day implement them, as whatwg-streams is a polyfill)

Author: ThisIsMissEm

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "[javascript]": {
+        "editor.formatOnSave": false
+    },
+}

package.json

@@ -60,5 +60,7 @@
     "url-search-params": "^1.0.2",
     "whatwg-url": "^5.0.0"
   },
-  "dependencies": {}
+  "dependencies": {
+    "web-streams-polyfill": "^1.3.2"
+  }
 }