rpc-probe fixes and kvstore-fixtures and tests

[greg-szabo]

Closes #756 .
Part of #723 .

• Important: all the JSON files in the change are auto-generated by rpc-probe. Do not review them in detail. (Here's a link where json files are filtered out.)

• Moved the rpc-probe folder into tools/rpc-probe.

• Removed the run-with-docker.sh script and implemented docker management using cargo-make in tools/rpc-probe/Makefile.toml.

• Changed rpc-probe to dump its results into rpc/tests/kvstore_fixtures by default.

• Implemented rpc/tests/kvstore_fixtures.rs tests that parse the rpc-probe results into Tendermint structs and make assertions against them.

• rpc-probe now generates requests with null input instead of {} where there is no parameter for the request. (Deserialization is implemented for nulls.)

• abci::transaction:Hash now has the PartialEq derive for easier testing.

• AbciQuery::prove now has default serialization. (That was a small bug.)

• 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-io]

Codecov Report

Merging #758 (145b245) into master (8bbb09b) will increase coverage by 5.7%.
The diff coverage is 99.0%.

@@           Coverage Diff            @@
##           master    #758     +/-   ##
========================================
+ Coverage    43.1%   48.8%   +5.7%     
========================================
  Files         204     197      -7     
  Lines       13620   13080    -540     
  Branches     3571    3226    -345     
========================================
+ Hits         5874    6391    +517     
+ Misses       7369    6323   -1046     
+ Partials      377     366     -11     

Impacted Files	Coverage Δ
rpc/src/endpoint/abci_query.rs	28.5% <ø> (ø)
tendermint/src/abci/transaction/hash.rs	47.5% <0.0%> (+6.4%)	⬆️
tools/rpc-probe/src/subscription.rs	0.0% <ø> (ø)
rpc/tests/kvstore-fixtures.rs	99.2% <99.2%> (ø)
tendermint/src/channel.rs	21.3% <0.0%> (-8.1%)	⬇️
rpc/src/endpoint/block.rs	30.7% <0.0%> (ø)
tendermint/src/public_key.rs	54.1% <0.0%> (ø)
rpc/src/endpoint/block_results.rs	0.0% <0.0%> (ø)
rpc/src/endpoint/broadcast/tx_sync.rs	0.0% <0.0%> (ø)
... and 16 more

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[thanethomson]

Looks good overall!