feature/cairo-makie-integration

[ndortega]

1. Added a package extension to provide helper utils to convert Figure's to HTTP.Response's
2. Updated upper bounds on several of the packages dependencies
3. Added a new log to the serverwelcome() function to show how many threads are being used in serveparallel()

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.30%. Comparing base (db0852d) to head (fe3a4fb).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
+ Coverage   99.20%   99.30%   +0.09%     
==========================================
  Files          19       20       +1     
  Lines        1138     1151      +13     
==========================================
+ Hits         1129     1143      +14     
+ Misses          9        8       -1     

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