Support further icon sizes

Problem/Motivation

Currently, this module takes a 512x512 icon and resizes it to 192x192 and 144x144 using PHP's image manipulation methods. This source https://web.dev/learn/pwa/web-app-manifest/#icons states, that further image sizes are recommended (384 by 384, and 1024 by 1024).

Steps to reproduce

Proposed resolution

Add support for 384 by 384, and 1024 by 1024 pixel-sized images.

Remaining tasks

User interface changes

API changes

Data model changes