macro to plot in Pluto

[diegozea]

Hi!

This PR exports the @html_plot macro to display R plots in Pluto:

This is related to fonsp/Pluto.jl#1085 and https://stackoverflow.com/questions/64049836/using-ggplot2-with-julia-pluto-notebook

I hope it is helpful,

Best regards,

[diegozea]

The failing checks look unrelated to this PR.

[diegozea]

NOTE: String interpolation is not working inside the macro.

[diegozea]

NOTE: It doesn't work for packages that create their own device inside a function, e.g.: https://www.rdocumentation.org/packages/factoextra/versions/1.0.7/topics/eigenvalue

[codecov]

Codecov Report

Patch coverage: 96.55% and project coverage change: +0.72% 🎉

Comparison is base (305efff) 75.16% compared to head (9053bd4) 75.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
+ Coverage   75.16%   75.89%   +0.72%     
==========================================
  Files          25       26       +1     
  Lines        1623     1651      +28     
==========================================
+ Hits         1220     1253      +33     
+ Misses        403      398       -5     

Files Changed	Coverage Δ
src/RCall.jl	100.00% <ø> (ø)
src/ijulia.jl	9.52% <80.00%> (+9.52%)	⬆️
src/html_plot.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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