test: add test to build random blocks and check if they're valid

[evan-forbes]

closes #588

see comment

[codecov-commenter]

Codecov Report

Merging #715 (3d2369b) into main (7bbb270) will increase coverage by 1.69%.
The diff coverage is 64.60%.

@@            Coverage Diff             @@
##             main     #715      +/-   ##
==========================================
+ Coverage   44.52%   46.22%   +1.69%     
==========================================
  Files          32       33       +1     
  Lines        3189     3217      +28     
==========================================
+ Hits         1420     1487      +67     
+ Misses       1666     1619      -47     
- Partials      103      111       +8     

Impacted Files	Coverage Δ
pkg/prove/querier.go	0.00% <0.00%> (ø)
pkg/shares/utils.go	4.08% <0.00%> (+4.08%)	⬆️
pkg/prove/proof.go	82.48% <73.68%> (-1.35%)	⬇️
pkg/shares/split_compact_shares.go	84.00% <77.77%> (+13.59%)	⬆️
pkg/shares/share_merging.go	70.78% <80.00%> (ø)
pkg/shares/split_sparse_shares.go	69.51% <90.00%> (ø)
pkg/da/data_availability_header.go	78.68% <100.00%> (ø)
pkg/shares/parse_compact_shares.go	77.77% <100.00%> (ø)
pkg/shares/parse_sparse_shares.go	88.60% <100.00%> (ø)
pkg/shares/share_splitting.go	60.24% <100.00%> (+46.98%)	⬆️
... and 9 more

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