message: feat: add `/version` api
  It will return a json like:
  ```js
  {
  z2m: <zwavejs2mqtt version>,
  zwavejs: <zwavejs version>,
  zwavejsServer: <zwavejs server version>,
  }
  ```
diff: @@ -39,6 +39,8 @@ import {
  PluginConstructor,
  } from './lib/CustomPlugin'
  import merge from 'merge'
  +import { libVersion } from 'zwave-js'
  +import { serverVersion } from '@zwave-js/server'
  declare module 'express' {
  interface Request {
  @@ -805,6 +807,14 @@ app.get('/health/:client', apisLimiter, function (req, res) {
  res.status(status ? 200 : 500).send(status ? 'Ok' : 'Error')
  })
  +app.get('/version', apisLimiter, function (req, res) {
  + res.json({
  + z2m: utils.getVersion(),
  + zwavejs: libVersion,
  + zwavejsServer: serverVersion,
  + })
  +})
  +
  // get settings
  app.get(
  '/api/settings',
  