Docs: add info on how to package utilities

[dreamorosi]

What were you searching in the docs?

Note
This issue has been opened in response to the discussion opened by @brianhyder

Some customers might need/want to package one or more utility instead of using the version published on npm. This is useful both during development and testing, as well as when needing to install a nightly version that hasn't been published.

Is this related to an existing documentation section?

No response

How can we improve?

We should provide instructions on how to build one or more packages in the `CONTRIBUTING` docs.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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