[TASK] Showcase colorPalette in EXT:styleguide

An example colorPalette picker is utilized for
the new field `tx_styleguide_elements_basic.color_palpreset`.

By default all defined colors available to palettes are
used as a fallback, so every colorpicker will receive
these palettes now. `color_palpreset` has a limited palette to
showcase both fallback and specific choice of colors.

A custom page.tsconfig is added, independent from the
Site Set file, to apply this to the backend.

Resolves: #103994
Related: #101843
Related: #98294
Releases: main
Change-Id: I18c06ddcd7938ea0b0088e3ee3b56e02a26ed3f9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84521


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: core-ci <typo3@b13.com>