Add TVU ASCII art

[garious]

No description provided.

[codecov]

Codecov Report

Merging #359 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   90.51%   90.51%           
=======================================
  Files          36       36           
  Lines        3428     3428           
=======================================
  Hits         3103     3103           
  Misses        325      325

Impacted Files	Coverage Δ
src/tvu.rs	97.81% <ø> (ø)	⬆️
src/replicate_stage.rs	95.45% <100%> (ø)	⬆️

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[aeyakovenko]

Validators exhange packets with each other. So the blob fetch stage gets input from both leaders and validators. And the window sends packets to other validators