chore: refactor genesis types to separate directory, mv controller interfaces registration to module.go (backport #2133)

[mergify]

This is an automatic backport of pull request #2133 done by Mergify.
Cherry-pick of f8f879b has failed:

On branch mergify/bp/release/v5.1.x/pr-2133
Your branch is up to date with 'origin/release/v5.1.x'.

You are currently cherry-picking commit f8f879b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/ibc/proto-docs.md
	modified:   modules/apps/27-interchain-accounts/controller/keeper/genesis.go
	modified:   modules/apps/27-interchain-accounts/controller/keeper/genesis_test.go
	modified:   modules/apps/27-interchain-accounts/controller/keeper/keeper.go
	modified:   modules/apps/27-interchain-accounts/controller/keeper/keeper_test.go
	renamed:    modules/apps/27-interchain-accounts/types/genesis.go -> modules/apps/27-interchain-accounts/genesis/types/genesis.go
	renamed:    modules/apps/27-interchain-accounts/types/genesis.pb.go -> modules/apps/27-interchain-accounts/genesis/types/genesis.pb.go
	renamed:    modules/apps/27-interchain-accounts/types/genesis_test.go -> modules/apps/27-interchain-accounts/genesis/types/genesis_test.go
	modified:   modules/apps/27-interchain-accounts/host/keeper/genesis.go
	modified:   modules/apps/27-interchain-accounts/host/keeper/genesis_test.go
	modified:   modules/apps/27-interchain-accounts/host/keeper/keeper.go
	modified:   modules/apps/27-interchain-accounts/host/keeper/keeper_test.go
	modified:   modules/apps/27-interchain-accounts/module.go
	modified:   modules/apps/27-interchain-accounts/types/codec.go
	renamed:    proto/ibc/applications/interchain_accounts/v1/genesis.proto -> proto/ibc/applications/interchain_accounts/genesis/v1/genesis.proto

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[damiannolan]

Thanks for handling conflicts on this one! <3