Add support for ibc hooks & add unit tests

[thomas-nguy]

#33 #36

Tested with Solo Machine and it works fine

Todo

• Add tests

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

Merging #35 (3ea70c5) into main (0880b6a) will increase coverage by 18.24%.
The diff coverage is 65.74%.

@@            Coverage Diff             @@
##            main      #35       +/-   ##
==========================================
+ Coverage   3.26%   21.51%   +18.24%     
==========================================
  Files         13       27       +14     
  Lines       1315     1729      +414     
==========================================
+ Hits          43      372      +329     
- Misses      1271     1324       +53     
- Partials       1       33       +32     

Impacted Files	Coverage Δ
app/app.go	3.95% <0.00%> (-0.03%)	⬇️
app/test_helpers.go	0.00% <0.00%> (ø)
x/cronos/types/keys.go	0.00% <0.00%> (ø)
x/cronos/types/messages.go	0.00% <0.00%> (ø)
x/cronos/keeper/evm.go	51.72% <51.72%> (ø)
x/cronos/keeper/ibc_hooks.go	58.82% <58.82%> (ø)
x/cronos/types/contracts.go	65.00% <65.00%> (ø)
x/cronos/keeper/ibc.go	78.18% <78.18%> (ø)
x/cronos/keeper/keeper.go	94.33% <93.75%> (+94.33%)	⬆️
x/cronos/keeper/params.go	72.72% <100.00%> (+72.72%)	⬆️
... and 19 more

---

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[yihuang]

the CI failure could be fixed with running this command to update the gomod2nix.toml file:

nix run -f ./nix gomod2nix -c gomod2nix

[yihuang]

gomod2nix.toml is not up to date according to CI failure.

[yihuang]

LGTM other than the CI failure, need to update the gomod2nix.toml.