Wasm querier integration tests

[ethanfrey]

Closes #269

• Test WasmQuery::Smart and WasmQuery::Raw via
• Test basic staking queries with reflect contract

Not done:

• Update docs explaining how to parse RawQuery (maybe update types in CosmWasm? maybe change from this []{Key, Value} return value...) - this is moved to Update RawQuery return value #275

[codecov]

Codecov Report

Merging #273 into master will increase coverage by 0.85%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   73.32%   74.17%   +0.85%     
==========================================
  Files          27       27              
  Lines        2339     2339              
==========================================
+ Hits         1715     1735      +20     
+ Misses        511      485      -26     
- Partials      113      119       +6     

Impacted Files	Coverage Δ
x/wasm/internal/keeper/keeper.go	90.30% <0.00%> (-0.61%)	⬇️
x/wasm/internal/keeper/query_plugins.go	77.69% <0.00%> (+15.82%)	⬆️

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[alpe]

🌷 Very nice.

[alpe]

pp: there was quite some effort to setup the test. I was wondering if a staking keeper mock would be an easier fit or what was your intention?

[ethanfrey]

We need to see how the query callbacks from the contracts really work.

I have a contract that will take the user input and use that to trigger a query via Querier. This allows us to see what a contract would see. And we need to see what would happen against a real staking keeper (as there are some bugs... we want to fix how those work, full stack for compatibility).