[FEATURE] Transform custom elements to `lit-html`

[eliashaeussler]

Is your feature request related to a problem?

We're still using jQuery as framework for custom HTML elements. jQuery is no longer the source of truth, especially not in context of TYPO3 v12.

Describe the solution you'd like

Transform all custom HTML elements to lit-html elements. In addition, transform remaining usages of jQuery to vanilla JavaScript to remove the dependency to jQuery.

Describe alternatives you've considered

No response

Additional context

Implementation in TYPO3 core: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Backend/JavaScript/Templating/Index.html

Code of Conduct

• I agree to follow this project's Code of Conduct.