feat: add initial scaffolding for the blobstream demo

[rach-id]

Overview

Adds to: #613

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (33f7618) 26.13% compared to head (7f65af3) 26.13%.

Additional details and impacted files

@@           Coverage Diff           @@
##             demo     #615   +/-   ##
=======================================
  Coverage   26.13%   26.13%           
=======================================
  Files          29       29           
  Lines        3019     3019           
=======================================
  Hits          789      789           
  Misses       2135     2135           
  Partials       95       95           

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[evan-forbes]

are we still needing to merge this?

[rach-id]

its in a separate branch, we can merge it then josh can continue working on it when he's back