feat: launch_gui command

[klmcadams]

• Users can call app.launch_gui() to launch their current project in graphical mode
• Uses subprocess.Popen to launch the GUI using the command line given the temporary project file and version of the project

[codecov]

Codecov Report

Attention: Patch coverage is 93.54839% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.04%. Comparing base (7ea9219) to head (cba9ec5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #882      +/-   ##
==========================================
+ Coverage   80.61%   81.04%   +0.42%     
==========================================
  Files          33       35       +2     
  Lines        2167     2226      +59     
==========================================
+ Hits         1747     1804      +57     
- Misses        420      422       +2