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

Attention: Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.38%. Comparing base (0bb0d53) to head (9bbe65b).

Files	Patch %	Lines
src/ijulia.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
- Coverage   80.15%   78.38%   -1.77%     
==========================================
  Files          26       27       +1     
  Lines        1693     1721      +28     
==========================================
- Hits         1357     1349       -8     
- Misses        336      372      +36     

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