feat: allow plugin.modal to open a fullscreen modal

[muselesscreator]

Small pull request to allow plugin.modal messages to open a fullscreen modal by passing an isFullscreen argument to the message.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bce25c4) 87.30% compared to head (ff7e700) 87.30%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1243   +/-   ##
=======================================
  Coverage   87.30%   87.30%           
=======================================
  Files         275      275           
  Lines        4717     4719    +2     
  Branches     1190     1192    +2     
=======================================
+ Hits         4118     4120    +2     
  Misses        580      580           
  Partials       19       19           

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[mattcarter]

approved