Tracking: Cosmos sdk 0.39

[ethanfrey]

This tracks the long-lived branch that adds cosmos-sdk 0.39-master support.

wasmd:master will track the last stable release (0.38.x) and from that we can tag releases. This branch will live for adding IBC integrations until a cosmos-sdk 0.39.0 release is made, at which point it can be merged into master.

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added relevant godoc comments.

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #146 into master will decrease coverage by 36.87%.
The diff coverage is 10.50%.

@@             Coverage Diff             @@
##           master     #146       +/-   ##
===========================================
- Coverage   67.90%   31.02%   -36.88%     
===========================================
  Files          23       22        -1     
  Lines        2053     3655     +1602     
===========================================
- Hits         1394     1134      -260     
- Misses        563     2426     +1863     
+ Partials       96       95        -1     

Impacted Files	Coverage Δ
app/genesis.go	0.00% <0.00%> (ø)
x/wasm/internal/keeper/genesis.go	0.00% <0.00%> (-92.99%)	⬇️
x/wasm/internal/types/genesis.go	0.00% <ø> (-94.12%)	⬇️
x/wasm/internal/types/msg.go	44.33% <ø> (+3.56%)	⬆️
x/wasm/internal/types/types.go	0.00% <ø> (-32.41%)	⬇️
x/wasm/module.go	18.18% <0.00%> (+0.40%)	⬆️
x/wasm/internal/types/types.pb.go	0.53% <0.53%> (ø)
app/export.go	7.31% <60.00%> (ø)
x/wasm/handler.go	58.55% <78.57%> (+8.55%)	⬆️
lcd_test/helpers.go	74.63% <94.11%> (-0.37%)	⬇️
... and 21 more

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[ethanfrey]

This is a good reference for the IBC integration: https://docs.cosmos.network/master/ibc/custom.html

[ethanfrey]

This was game of zone phase 3. More stable but outdated from #172