feat: int in-place testnet creation (backport #4297)

[mergify]

close: #4244

This PR includes additional in-place-testnet command

---

This is an automatic backport of pull request #4297 done by Mergify.

[mergify]

Cherry-pick of f7618d3 has failed:

On branch mergify/bp/release/v28.x.y/pr-4297
Your branch is up to date with 'origin/release/v28.x.y'.

You are currently cherry-picking commit f7618d3e.
  (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
	modified:   ignite/cmd/cmd.go
	new file:   ignite/cmd/testnet.go
	new file:   ignite/cmd/testnet_inplace.go
	new file:   ignite/pkg/chaincmd/in-place-testnet.go
	modified:   ignite/pkg/chaincmd/runner/chain.go
	modified:   ignite/services/chain/runtime.go
	new file:   ignite/services/chain/testnet.go
	modified:   ignite/templates/app/files/app/app.go.plush
	modified:   ignite/templates/app/files/cmd/{{binaryNamePrefix}}d/cmd/commands.go.plush
	new file:   ignite/templates/app/files/cmd/{{binaryNamePrefix}}d/cmd/testnet.go.plush
	modified:   ignite/templates/app/files/go.mod.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/pkg/chaincmd/chaincmd.go

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

[github-actions]

Visit the preview URL for this PR (updated for commit fe3c15f):

https://igntservices-docs--pr4338-mergify-bp-release-v-2p0tooc2.web.app

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[julienrbrt]

tACK!

Let's fix #4305 and #4318 ASAP and we are good for a minor release,