docs(vignette): Integrate MSstats workflow into vignette and test data

[tonywu1999]

Motivation and Context

Based on bioc feedback, there was no clear relationship between the MSstats workflow and MSstatsBioNet. This PR attempts to integrate the two workflows into the MSstatsBioNet vignette.

Changes

• Add MSstatsConvert and MSstats workflows into MSstatsBioNet vignette
• Move data to /inst/extdata directory
• Add script demonstrating how to create dataset in /inst/extdata directory
• Update documentation

Testing

• Unit tests have been updated and pass
• RMD check passes

Checklist Before Requesting a Review

• I have read the MSstats contributing guidelines
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.61%. Comparing base (f8aa0f8) to head (a09b9bd).
Report is 2 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #13      +/-   ##
==========================================
+ Coverage   87.50%   87.61%   +0.11%     
==========================================
  Files           3        3              
  Lines         104      105       +1     
==========================================
+ Hits           91       92       +1     
  Misses         13       13              

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