Integrate wasm module

[ethanfrey]

• Copied in wasm module from cosmwasm/modules
• Updated code to cosmos-sdk:master
• Wrote cli commands
• Integrated wasm with app
• Tested workflows and document in docs/deploy-testnet.md

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-io]

Codecov Report

Merging #2 into master will decrease coverage by 7.26%.
The diff coverage is 50.93%.

@@            Coverage Diff            @@
##           master      #2      +/-   ##
=========================================
- Coverage   66.46%   59.2%   -7.27%     
=========================================
  Files           5      11       +6     
  Lines         501     929     +428     
=========================================
+ Hits          333     550     +217     
- Misses        137     329     +192     
- Partials       31      50      +19

Impacted Files	Coverage Δ
x/wasm/genesis.go	0% <0%> (ø)
x/wasm/internal/keeper/querier.go	0% <0%> (ø)
x/wasm/internal/keeper/test_common.go	100% <100%> (ø)
app/app.go	88.88% <100%> (+0.42%)	⬆️
x/wasm/module.go	18.6% <18.6%> (ø)
x/wasm/internal/keeper/keeper.go	57.59% <57.59%> (ø)
x/wasm/handler.go	80.59% <80.59%> (ø)
... and 3 more

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