runtime: Add support for runtime queries

[kostko]

Based on #3653

[pro-wh]

might it also make sense to expose CheckTx this way?

[kostko]

might it also make sense to expose CheckTx this way?

That's a very good idea.

[codecov]

Codecov Report

Merging #3662 (592430c) into master (9e37cea) will decrease coverage by 0.03%.
The diff coverage is 65.57%.

@@            Coverage Diff             @@
##           master    #3662      +/-   ##
==========================================
- Coverage   66.76%   66.72%   -0.04%     
==========================================
  Files         393      393              
  Lines       38274    38335      +61     
==========================================
+ Hits        25552    25580      +28     
- Misses       9069     9091      +22     
- Partials     3653     3664      +11     

Impacted Files	Coverage Δ
go/runtime/host/protocol/types.go	42.85% <ø> (ø)
go/runtime/client/client.go	64.43% <38.46%> (-1.25%)	⬇️
go/runtime/host/helpers.go	55.55% <60.00%> (+3.17%)	⬆️
go/runtime/client/api/grpc.go	61.29% <61.11%> (-0.02%)	⬇️
go/runtime/client/tests/tester.go	100.00% <100.00%> (ø)
go/runtime/host/mock/mock.go	88.73% <100.00%> (+0.85%)	⬆️
go/consensus/tendermint/abci/state/state.go	54.54% <0.00%> (-9.10%)	⬇️
...nsensus/tendermint/apps/beacon/state/state_pvss.go	69.23% <0.00%> (-7.70%)	⬇️
go/worker/common/committee/runtime_host.go	64.28% <0.00%> (-6.25%)	⬇️
go/consensus/api/submission.go	69.01% <0.00%> (-4.23%)	⬇️
... and 29 more

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[kostko]

@pro-wh Also exposed CheckTx now.

[pro-wh]

thanks for the changes, lg