[Feature Request]: Nest options under `Arbitrary Horizontal Lines` and `Arbitrary Vertical Lines` for tm_g_gh_correlationplot

[m7pr]

Feature description

Horizontal and Vertical lines have the same parameter input which looks odd on the left sidebar panel that has two separate inputs for colour and for labels when tm_g_gh_correlationplot is used.

I would suggest nesting Arbitrary Horizontal Lines options into foldable tab and do the same for Horizontal, as we do for Plot Aesthetics

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[npaszty]

happy to review what this might look like. Criteria for UI is that it needs to be intuitive to users.