Add function to return root of a proof that can later be verified via a signing scheme.

[QuantumExplorer]

Using verify query on light clients would require them to be supplied with the expected root hash, in addition to the proof, keys and signature. Since the proof already contains the root_hash, and any other root hash wouldn't match for the signature, it would be optimal not to send it.

The change requested decomposes verify_query into a new function query_proof_root that returns the root hash as well as the result of querying the keys.

[codecov-commenter]

Codecov Report

Merging #51 (806d873) into develop (2b31f6f) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #51      +/-   ##
===========================================
+ Coverage    89.90%   89.94%   +0.04%     
===========================================
  Files           23       23              
  Lines         2555     2557       +2     
===========================================
+ Hits          2297     2300       +3     
+ Misses         258      257       -1     

Impacted Files	Coverage Δ
src/proofs/verify.rs	94.97% <100.00%> (+0.50%)	:arrow_up:

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[QuantumExplorer]

Closing this, and will make a new PR potentially eventually with the same idea.

[mappum]

@QuantumExplorer cool, might make sense to do it by adding a root_hash method to Map