Reimplement proof verifier

[pav-kv]

Part of #3

[codecov-commenter]

Codecov Report

Merging #24 (04ef8ac) into main (607eb47) will decrease coverage by 0.14%.
The diff coverage is 96.37%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
- Coverage   96.89%   96.75%   -0.15%     
==========================================
  Files           6        5       -1     
  Lines         387      370      -17     
==========================================
- Hits          375      358      -17     
  Misses         10       10              
  Partials        2        2              

Impacted Files	Coverage Δ
proof/verify.go	94.44% <94.44%> (ø)
compact/nodes.go	85.71% <100.00%> (+1.09%)	⬆️
compact/range.go	100.00% <100.00%> (ø)
proof/proof.go	97.14% <100.00%> (+0.20%)	⬆️

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