Define GeometryStyle and OperatorStyle for multiple arguments

[AFeuerpfeil]

This PR is a follow up some work to make it possible/easier to add custom state or operator types without having to alter their base implementations, and without having to redefine a bunch of functionality that already just works.

This PR defines standard promotion rules for the styles in the form of
GeometryStyle(x, y, zs...) and OperatorStyle(x, y, zs...)
by recursively comparing the styles of the objects.

An example, where this is needed, are environments(below, operator, above).
This PR allows to extract and validate the common GeometryStyle by calling:

GeometryStyle(below, operator, above)

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/utility/styles.jl	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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