feat: Add multi node (validator) testnet (backport #4377)

[mergify]

Closes: #4374

This PR added the feature to ignite multi-node testnet.

Test steps:

1. ignite scaffold chain github.com/test/mychain
2. cd mychain
3. go install ./...
4. ignite testnet multi-node

The interface looks like this:

---

This is an automatic backport of pull request #4377 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of b7e3ab3 has failed:

On branch mergify/bp/release/v28.x.y/pr-4377
Your branch is up to date with 'origin/release/v28.x.y'.

You are currently cherry-picking commit b7e3ab3c.
  (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:   changelog.md
	renamed:    ignite/cmd/model/chain_debug.go -> ignite/cmd/bubblemodel/chain_debug.go
	renamed:    ignite/cmd/model/chain_serve.go -> ignite/cmd/bubblemodel/chain_serve.go
	renamed:    ignite/cmd/model/testdata/testdata.go -> ignite/cmd/bubblemodel/testdata/testdata.go
	new file:   ignite/cmd/bubblemodel/testnet_multi_node.go
	deleted:    ignite/cmd/model/chain_debug_test.go
	deleted:    ignite/cmd/model/chain_serve_test.go
	modified:   ignite/cmd/testnet.go
	new file:   ignite/cmd/testnet_multi_node.go
	modified:   ignite/config/chain/v1/config.go
	modified:   ignite/pkg/chaincmd/chaincmd.go
	modified:   ignite/pkg/chaincmd/in-place-testnet.go
	modified:   ignite/pkg/chaincmd/runner/chain.go
	modified:   ignite/pkg/markdownviewer/markdownviewer.go
	modified:   ignite/services/chain/runtime.go
	modified:   ignite/services/chain/testnet.go
	new file:   ignite/templates/app/files/cmd/{{binaryNamePrefix}}d/cmd/testnet_multi_node.go.plush
	modified:   ignite/templates/app/files/config.yml.plush

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/docs/03-CLI-Commands/01-cli-commands.md
	both modified:   ignite/cmd/bubblemodel/chain_debug_test.go
	both modified:   ignite/cmd/bubblemodel/chain_serve_test.go
	both modified:   ignite/cmd/chain_debug.go
	both modified:   ignite/cmd/chain_serve.go
	both modified:   ignite/templates/app/files/cmd/{{binaryNamePrefix}}d/cmd/commands.go.plush

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

[julienrbrt]

Hey @likesToEatFish, could you open a PR making it work with v28 (0.50).
You had that first before main migrated to v0.52. Thanks!

[github-actions]

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[likesToEatFish]

Hey @likesToEatFish, could you open a PR making it work with v28 (0.50). You had that first before main migrated to v0.52. Thanks!

ok let me

[julienrbrt]

tACK