Plugin metrics (#7626)

* feat: add enable/disable checkbox for plugin usage

* feat: submit plugin data to packages.nodebb.org

only submit in production mode
submit once every 24 hours
dont submit for plugins that have "private": true in plugin.json
enabled on new installs
disabled on existing installs

* fix: hash not working after first send

fix statusCode

* fix: remove url

* feat: show compatibilty

* feat: add install question for submit plugin usage

src/plugins/usage.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const nconf = require('nconf');
+const request = require('request');
+const winston = require('winston');
+const crypto = require('crypto');
+const cronJob = require('cron').CronJob;
+
+const pkg = require('../../package.json');
+
+const meta = require('../meta');
+
+module.exports = function (Plugins) {
+	Plugins.startJobs = function () {
+		new cronJob('0 0 0 * * *', function () {
+			Plugins.submitUsageData();
+		}, null, true);
+	};
+
+	Plugins.submitUsageData = function () {
+		if (!meta.config.submitPluginUsage || !Plugins.loadedPlugins.length || global.env !== 'production') {
+			return;
+		}
+
+		const hash = crypto.createHash('sha256');
+		hash.update(nconf.get('url'));
+		request.post((nconf.get('registry') || 'https://packages.nodebb.org') + '/api/v1/plugin/usage', {
+			form: {
+				id: hash.digest('hex'),
+				version: pkg.version,
+				plugins: Plugins.loadedPlugins,
+			},
+			timeout: 5000,
+		}, function (err, res, body) {
+			if (err) {
+				return winston.error(err);
+			}
+			if (res.statusCode !== 200) {
+				winston.error('[plugins.submitUsageData] received ' + res.statusCode + ' ' + body);
+			}
+		});
+	};
+};