feat: add demo for streaming response to file

demos/stream-response-to-file/.gitignore

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+output/*
+output/contents.txt

demos/stream-response-to-file/index.js

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+const { request } = require("../../packages/arcgis-rest-request");
+const fs = require("fs");
+const fetch = require('node-fetch');
+require('isomorphic-form-data')
+
+const outFile = fs.createWriteStream(`./output/${Date.now()}.geojson`);
+const serviceUrl = "https://services.arcgis.com/uUvqNMGPm7axC2dD/arcgis/rest/services/Boating_Access_Sites/FeatureServer/0/query";
+
+request(serviceUrl, {
+  params: {
+    where: "1=1",
+    outSR: "4326",
+    outFields: "*",
+    returnGeometry: true,
+    f: "geojson"
+  },
+  stream: true,
+  fetch: fetch
+}).then((resp) => {
+  resp.pipe(outFile);
+  resp.on('data', () => {
+    console.log('Chunk received')
+  });
+  resp.on('end', () => {
+    console.log('Finished!');
+  });
+}).catch((err) => {
+  console.log(err);
+})

demos/stream-response-to-file/package.json

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+{
+  "name": "stream-response-to-file",
+  "version": "1.16.1",
+  "description": "stream response to file with arcgis-rest-request",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Esri/arcgis-rest-js.git"
+  },
+  "keywords": [
+    "arcgis",
+    "rest",
+    "stream",
+    "node"
+  ],
+  "author": "Joshua Tanner",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/Esri/arcgis-rest-js/issues"
+  },
+  "homepage": "https://github.com/Esri/arcgis-rest-js#readme",
+  "dependencies": {
+    "isomorphic-form-data": "^2.0.0",
+    "node-fetch": "^2.3.0"
+  }
+}