chore: fix broken upstream references

[spoo-bar]

Due to upstream dependencies like cosmos-sdk and ibc-go, moving around their code/packages, some code references are broken. This PR mainly deals with that.

Additionally,

• Commenting out the x/distr and x/wasm related proposal handlers (cuz x/gov has been refactored)
• Removing the REST stuff from the app API route registration (cuz REST stuff has been deprecated)
• simapp.Gentx was removed for some reason. Added it back.

This PR should now allow go mod tidy to successfully run. Next step make make build work 🚀

[spoo-bar]

I take it the GH Action build failures are due to this being wip... successful build only expected after step 6/7 right?

Yupp. Still a while away