Add KWin Support Information KCM

Merged Nate Graham requested to merge work/ngraham/kcm_kwinsupportinfo into master

This should help bug reporters gather relevant KWin information more easily.

co-authored-by: Harald Sitter


(the text on top being cut off is a pre-existing issue with the base component we use to display this content and needs to be fixed separately)

@sitter @broulik @teams/vdg

This is a very small amount of code with practically no maintenance burden and possibility of introducing new bugs, so I would like to merge this for 5.26 and hereby request an exception to the soft feature freeze. cc @jriddell about that.

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