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/controllers/admin/plugins.js

@@ -1,7 +1,9 @@
 'use strict';
 
 var async = require('async');
+var nconf = require('nconf');
 var plugins = require('../../plugins');
+var meta = require('../../meta');
 
 var pluginsController = module.exports;
 
@@ -57,6 +59,8 @@ pluginsController.get = function (req, res, next) {
 				incompatible: payload.all.filter(function (plugin) {
 					return !compatiblePkgNames.includes(plugin.name);
 				}),
+				submitPluginUsage: meta.config.submitPluginUsage,
+				version: nconf.get('version'),
 			});
 		},
 	], next);