feat(blob): add marshaling for blob and proof

[vgonkivs]

Overview

Add marshaler fro blob and proof

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

[codecov-commenter]

Codecov Report

Merging #2286 (a94b1df) into main (d53efbd) will increase coverage by 0.30%.
The diff coverage is 86.04%.

@@            Coverage Diff             @@
##             main    #2286      +/-   ##
==========================================
+ Coverage   50.60%   50.90%   +0.30%     
==========================================
  Files         154      154              
  Lines        9620     9663      +43     
==========================================
+ Hits         4868     4919      +51     
+ Misses       4328     4320       -8     
  Partials      424      424              

Impacted Files	Coverage Δ
blob/blob.go	65.88% <86.04%> (+20.64%)	⬆️

... and 2 files with indirect coverage changes

[Wondertan]

Nice