Allow pm.require API to import packages in sandbox

[coditva]

Allow importing packages using pm.require inside sandbox. The packages are kept as a reference inside packages key in the collection and are resolved before the script is executed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.23077% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 79.09%. Comparing base (bb1bf4d) to head (ed5d921).

Files	Patch %	Lines
lib/runner/extensions/event.command.js	94.23%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1377      +/-   ##
===========================================
+ Coverage    79.05%   79.09%   +0.03%     
===========================================
  Files           45       45              
  Lines         3356     3367      +11     
  Branches       965      970       +5     
===========================================
+ Hits          2653     2663      +10     
- Misses         703      704       +1     

Flag	Coverage Δ
integration	70.50% <94.23%> (+0.06%)	⬆️
legacy	46.03% <86.53%> (+0.05%)	⬆️
unit	41.75% <0.00%> (-0.14%)	⬇️

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