Testgen tester

[andrey-kuprianov]

See #524

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGELOG.md

[codecov-commenter]

Codecov Report

Merging #525 into master will decrease coverage by 0.1%.
The diff coverage is 21.5%.

@@           Coverage Diff            @@
##           master    #525     +/-   ##
========================================
- Coverage    29.8%   29.6%   -0.2%     
========================================
  Files         135     136      +1     
  Lines        5515    5681    +166     
  Branches     1695    1783     +88     
========================================
+ Hits         1647    1687     +40     
- Misses       2817    2881     +64     
- Partials     1051    1113     +62     

Impacted Files	Coverage Δ
testgen/src/tester.rs	21.5% <21.5%> (ø)
light-client/src/predicates/errors.rs	4.5% <0.0%> (-10.7%)	⬇️
tendermint/src/block/commit_sig.rs	28.7% <0.0%> (-1.1%)	⬇️
light-client/src/predicates.rs	85.0% <0.0%> (-0.9%)	⬇️
tendermint/src/block/height.rs	41.4% <0.0%> (ø)
tendermint/src/amino_types/vote.rs	28.6% <0.0%> (+0.4%)	⬆️
light-client/src/operations/voting_power.rs	54.8% <0.0%> (+0.7%)	⬆️
tendermint/src/amino_types/proposal.rs	23.2% <0.0%> (+0.8%)	⬆️
light-client/src/types.rs	41.8% <0.0%> (+1.8%)	⬆️
... and 5 more

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[Shivani912]

This is awesome @andrey-kuprianov ! I just have a minor change request and few comments on clippy suggestions.

Also, I think it'll be useful to have more code comments if possible ! Otherwise, this looks great!! 🎉

[andrey-kuprianov]

Thanks for your suggesstions, @Shivani912! I have addressed them. Also, it's quite true that the source-level comments are very sparse right now, but what you see here is only a preliminary version of the Tester. I am already extending it substantially further under #414 , and there I will add more documentation. If there are no objections, I would like to merge this PR now, and the PR for #414 will follow shortly.

[Shivani912]

Thanks @andrey-kuprianov for explaining.
This looks really good, we have much cleaner and organized code now. Let's merge it !