Create GH actions workflow to run the catalog generator

The goal is to create a workflow in GH actions that can be triggered:

1. Manually with inputs: target platform, branch name, version, open PR (optional) 
   • For both LTS 2019 (10.10) and LTS 2021 (3.0.x) 

1. Automatically (runs after the promotion script) 
   1. For LTS 2021 only, because 10.10 HFs releases are performed by the support team (we don’t control the process) 
   2. It should open a PR on NOS repository to update the pom.xml and pom.xml files with the new catalog version 

The artifacts should be pushed to packages.nuxeo.com (maven-public) to be consume by NOS CI during the build process.

Legacy CI job: https://qa.nuxeo.org/jenkins/job/Private/job/NOS/job/nos-designer-catalog-lts-2021/