HTML Learning Module in IRSS

[chfsx]

This PR contains the implementation of the Container Resource GUI as decided yesterday: IRSS: Container-Resource User-interface

The changes to the IRSS are in the following commit for your info, which I will cherry-pick in the next few days: https://github.com/ILIAS-eLearning/ILIAS/pull/7214/commits/cdbb7bcec5c8149bf54d76938c926380bb2b4a52

The following commit also contains a readme on how to use the container GUI in your component: https://github.com/ILIAS-eLearning/ILIAS/pull/7214/commits/93e0d7884cf83eccc1815ec1240943ebea6c2b52

as a first use I have already rebuilt the HTML learning module, incl. migration. after I have merged the other two commits, I would give you Alex the PR regarding the changes in the learning module: https://github.com/ILIAS-eLearning/ILIAS/pull/7214/commits/d3c735810ab2e851f9be16ca6d1792ae3d86bbf8

The adjustments to the breadcrumb will follow separately as PR