Add flow deps discover command

[jribbink]

Closes #1754

Description

Adds flow deps discover command to allow users to interactively install Core Contracts.

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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 2.27273% with 43 lines in your changes missing coverage. Please review.

Project coverage is 29.48%. Comparing base (a78ff06) to head (0b5e3e1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/dependencymanager/discover.go	0.00%	42 Missing ⚠️
internal/super/setup.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1761      +/-   ##
==========================================
- Coverage   29.54%   29.48%   -0.07%     
==========================================
  Files          88       89       +1     
  Lines        5154     5169      +15     
==========================================
+ Hits         1523     1524       +1     
- Misses       3444     3458      +14     
  Partials      187      187              

Flag	Coverage Δ
unittests	29.48% <2.27%> (-0.07%)	⬇️

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[chasefleming]

@jribbink Dont forget to update the docs for these new commands please.