✨ Add machinery utility functions

[Adirio]

This PR adds machinery utility function to insert, replace or prefix/unprefix parts of the code.

Similar functions were being provided in the test package which should probably not export anything API-wise.

TODO:

• Unit tests

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[k8s-ci-robot]

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[Adirio]

@camilamacedo86 @estroz I would like to get some feedback on the conceptual idea and functions signature before implementing the tests.

[estroz]

@Adirio the new functions LGTM!

[camilamacedo86]

+1. Feel free to make that a PR.

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[k8s-ci-robot]

@Adirio: PR needs rebase.

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[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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