Add plot recipe

[hyrodium]

julia> using IntervalSets, Plots

julia> plot(iv"(1,2)"); plot!(iv"[3,6)"); plot!(iv"[5,7)")

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (13c76e1) 99.11% compared to head (65e47ff) 98.84%.
Report is 8 commits behind head on master.

Files	Patch %	Lines
ext/IntervalSetsRecipesBaseExt.jl	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   99.11%   98.84%   -0.27%     
==========================================
  Files           6        6              
  Lines         225      260      +35     
==========================================
+ Hits          223      257      +34     
- Misses          2        3       +1     

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[hyrodium]

Note that the open endpoints are not transparent.

julia> using IntervalSets, Plots

julia> plot(iv"[1,3]"); plot!(iv"(2,4)")

The offset keyword argument is useful for better visualization.

julia> using IntervalSets, Plots

julia> plot(iv"[1,3]"); plot!(iv"(2,4)"; offset=-0.1, ylims=(-1,1))