Extend LayerStatistics

[cbielow]

Description

followup on #5713

enable creation of distributions from LayerStatistics -- remove a lot of duplicate code in Canvas'

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Advanced commands (admins / reviewer only):

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[timosachsenberg]

there seems to be a merge conflict. attempt of a quick fix

[timosachsenberg]

if tests pass

[cbielow]

there seems to be a merge conflict. attempt of a quick fix

thanks!

Seems all good. Will merge.