Derive PartialEq and Eq on more types

[romac]

Closes: #969

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #970 (7d8807e) into master (b99c937) will increase coverage by 0.0%.
The diff coverage is 85.7%.

@@          Coverage Diff           @@
##           master    #970   +/-   ##
======================================
  Coverage    72.1%   72.1%           
======================================
  Files         203     203           
  Lines       16589   16581    -8     
======================================
- Hits        11964   11962    -2     
+ Misses       4625    4619    -6     

Impacted Files	Coverage Δ
rpc/src/error.rs	0.0% <0.0%> (ø)
tendermint/src/error.rs	0.0% <0.0%> (ø)
rpc/src/endpoint/abci_query.rs	21.4% <100.0%> (ø)
tendermint/src/block/commit.rs	96.8% <100.0%> (ø)
tendermint/src/block/commit_sig.rs	76.5% <100.0%> (-2.2%)	⬇️
tendermint/src/block/header.rs	99.1% <100.0%> (ø)
tendermint/src/block/signed_header.rs	91.6% <100.0%> (ø)
tendermint/src/hash.rs	36.8% <100.0%> (-1.0%)	⬇️
tendermint/src/signature.rs	56.6% <100.0%> (ø)
tendermint/src/validator.rs	69.2% <100.0%> (ø)
... and 7 more

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[adizere]

Looks good!

[xla]

1️⃣ 🍦 🧀 🏺