Add command for generating test files

[jribbink]

Closes #1760

Description

Adds flow generate test

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 29.69%. Comparing base (5ab1b47) to head (b7c2c96).

Files with missing lines	Patch %	Lines
internal/super/generate.go	16.66%	5 Missing ⚠️
internal/super/generator/test_template.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1773      +/-   ##
==========================================
- Coverage   29.73%   29.69%   -0.05%     
==========================================
  Files          94       94              
  Lines        5176     5183       +7     
==========================================
  Hits         1539     1539              
- Misses       3458     3464       +6     
- Partials      179      180       +1     

Flag	Coverage Δ
unittests	29.69% <33.33%> (-0.05%)	⬇️

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