add size attributes to template jsonConfig.json

[mcm1957]

Please consider to add xs/sm/md/lg/xl size attributes to template jsonConfig

[AlCalzone]

An example would be helpful.

[mcm1957]

for example see backitup adapter
https://github.com/simatec/ioBroker.backitup/blob/14599fac81c7437d140a832e0708ea7fb66955ae/admin/ccu.jsonConfig.json5#L29

    "backupNow": {
      "type": "custom",
      "button": true,
      "variant": "contained",
      "url": "custom/customComponents.js",
      "name": "ConfigCustomBackItUpSet/Components/BackupNow",
      "backUpType": "ccu",
      "icon": "data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0iY3VycmVudENvbG9yIj4NCiAgICA8cGF0aCBkPSJNMTkuMzUgMTAuMDRDMTguNjcgNi41OSAxNS42NCA0IDEyIDQgOS4xMSA0IDYuNiA1LjY0IDUuMzUgOC4wNCAyLjM0IDguMzYgMCAxMC45MSAwIDE0YzAgMy4zMSAyLjY5IDYgNiA2aDEzYzIuNzYgMCA1LTIuMjQgNS01IDAtMi42NC0yLjA1LTQuNzgtNC42NS00Ljk2ek0xNCAxM3Y0aC00di00SDdsNS01IDUgNWgtM3oiLz4NCjwvc3ZnPg0K",
      "label": "Backup now",
      "newLine": true,
      "xs": 12,
      "sm": 9,
      "md": 6,
      "lg": 3
    },

Doku
https://github.com/ioBroker/ioBroker.admin/blob/master/packages/jsonConfig/SCHEMA.md#common-attributes-of-controls

Example should include all five attributes (xs, sm, md, lg, xl)