[TASK] Extend component library examples in "Styleguide" backend module

The new markup for examples, previously introduced on the Avatar
component page, has been rolled out to all example pages within the
"Styleguide" backend module. The component pages, as well as the styles
pages, are expanded to include more application examples and color
scheme examples.

In this context the CodeViewHelper has been split into three individual
ViewHelpers to make functionalities clearer.

Resolves: #104464
Related: #104371
Releases: main
Change-Id: I581e60b06eb0e9494895917495c3214fc014d0b4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85285


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>