refactor(share): move bad encoding fraud proof to share pkg

[walldiss]

Resolves #1100

[codecov-commenter]

Codecov Report

Merging #1241 (e26ed96) into main (f4e582e) will decrease coverage by 0.59%.
The diff coverage is 46.59%.

@@            Coverage Diff             @@
##             main    #1241      +/-   ##
==========================================
- Coverage   56.34%   55.75%   -0.60%     
==========================================
  Files         160      164       +4     
  Lines        9935    10046     +111     
==========================================
+ Hits         5598     5601       +3     
- Misses       3783     3887     +104     
- Partials      554      558       +4     

Impacted Files	Coverage Δ
fraud/pb/proof.pb.go	34.71% <0.00%> (-1.90%)	⬇️
share/eds/byzantine/byzantine.go	69.23% <ø> (ø)
share/get.go	90.32% <ø> (+9.07%)	⬆️
share/share.go	100.00% <ø> (ø)
share/eds/byzantine/pb/share.pb.go	32.88% <33.67%> (ø)
share/eds/byzantine/share_proof.go	88.88% <88.88%> (ø)
das/daser.go	66.27% <100.00%> (ø)
fraud/testing.go	90.27% <100.00%> (+3.00%)	⬆️
share/eds/byzantine/bad_encoding.go	63.00% <100.00%> (ø)
share/eds/retriever.go	91.97% <100.00%> (ø)
... and 35 more

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