UnfoldMakie.jl: EEG/ERP visualization package

Release notes:

Done by @vladdez Review by @behinger

Bufgixes:

• removes the 1.11 Random requirement
• update old tests like test/test_complexplots.jl
• #373 + better documentation
• yticks and xticks of plot_erp with extrema and 3 intermediate values

Significance addressed

• #242
• deprecate significance_plotgeom
• add significance_visual
• add named tuples significance_vspan and significance_lines with possibility to control, gap, height and alpha of significance geoms

Global changes

• test and doc actions running separately -> less running time, run only when necessary
• add experiment folder in .gitignore