docs(maintainers): add style guide for input and output

[zimeg]

Changelog

N/A 📚 ✨

Summary

This PR adds a STYLE_GUIDE.md for common input and output patterns we're hoping to match- 🎨 📺

Notes

The current page is somewhat sparse but might be updated as confusion is found in ongoing change!

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.95%. Comparing base (55a4069) to head (3a8f333).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
+ Coverage   68.93%   68.95%   +0.02%     
==========================================
  Files         220      220              
  Lines       18446    18446              
==========================================
+ Hits        12715    12719       +4     
+ Misses       4557     4554       -3     
+ Partials     1174     1173       -1     

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