docs(api): create step groups in API 2.29

[emilyburghardt]

Overview

Adding step grouping to the API docs for 2.29. Includes a screenshot showing why this is useful in protocol visualization!

Test Plan and Hands on Testing

Sandbox

Changelog

• create a new groups.md file to describe step groups
• add a screenshot to show why this matters (use in protocol viz)
• update API reference

Review requests

Risk assessment

low.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.71%. Comparing base (5cce5e3) to head (e418315).
⚠️ Report is 1 commits behind head on chore_release-9.1.0.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           chore_release-9.1.0   #21556   +/-   ##
====================================================
  Coverage                21.71%   21.71%           
====================================================
  Files                     3912     3912           
  Lines                   327343   327343           
  Branches                 58203    58203           
====================================================
  Hits                     71076    71076           
  Misses                  253295   253295           
  Partials                  2972     2972           

Flag	Coverage Δ
app	46.01% <ø> (ø)

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