Use node prefix for build-in modules (#3340)

It is basically a cosmetic thing, but has the following advantages:

1. Consistency with the official node documentation. The prefix is used
there.
2. It is easier to recognize the build-in modules.

modules/default/calendar/calendarfetcher.js

@@ -5,7 +5,7 @@
  * MIT Licensed.
  */
 
-const https = require("https");
+const https = require("node:https");
 const ical = require("node-ical");
 const Log = require("logger");
 const NodeHelper = require("node_helper");

modules/default/calendar/calendarfetcherutils.js

@@ -8,7 +8,7 @@
 /**
  * @external Moment
  */
-const path = require("path");
+const path = require("node:path");
 const moment = require("moment");
 
 const zoneTable = require(path.join(__dirname, "windowsZones.json"));

modules/default/newsfeed/newsfeedfetcher.js

@@ -5,7 +5,7 @@
  * MIT Licensed.
  */
 
-const stream = require("stream");
+const stream = require("node:stream");
 const FeedMe = require("feedme");
 const iconv = require("iconv-lite");
 const { htmlToText } = require("html-to-text");

modules/default/updatenotification/git_helper.js

@@ -1,7 +1,7 @@
-const util = require("util");
-const exec = util.promisify(require("child_process").exec);
-const fs = require("fs");
-const path = require("path");
+const util = require("node:util");
+const exec = util.promisify(require("node:child_process").exec);
+const fs = require("node:fs");
+const path = require("node:path");
 const Log = require("logger");
 
 const BASE_DIR = path.normalize(`${__dirname}/../../../`);

modules/default/updatenotification/update_helper.js

@@ -1,5 +1,5 @@
-const Exec = require("child_process").exec;
-const Spawn = require("child_process").spawn;
+const Exec = require("node:child_process").exec;
+const Spawn = require("node:child_process").spawn;
 const commandExists = require("command-exists");
 const Log = require("logger");