Revert "feat: remove experimental-utils"

[JoshuaKGoldberg]

Reverts #6468

Discussed privately - letting the changes in #6179 live for a little while.

[typescript-eslint]

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[bradzacher]

just to revisit this and have a chat in the open.

utils was officially released in 5.10.0 (18/1/2022 - 419 days ago) at which point we officially (but silently) deprecated experimental-utils.

#6179 (which causes a console log) on usage will create noise for consumers that have experimental-utils as a transient dependency, which isn't a great UX.

The two options we have are:

• explicitly npm deprecate experimental-utils and hard-lock it as a <v6 package
• release experimental-utils with the console logs and v6, and create some noise for the user (to hopefully help drive migrations), and then officially drop it with v7.

Personally I think the former is better because (a) the deprecation message is install-time-only, so it won't spam users' lint runs and (b) hard-locking to v5 means packages can't be lazy - they have to migrate to keep updated.

I'd love to hear your thoughts again Josh, maybe @typescript-eslint/triage-team has some thoughts as well?

[JoshuaKGoldberg]

FWIW this isn't a strong feeling on my end - I'm happy going along with either.

Part of why I was excited about going with #6179's console log is that @kball got to contribute, and I didn't want that contribution to end up going nowhere. But if (a) is the better case instead, that works too.

[JoshuaKGoldberg]

(closing for now since it seems this PR isn't particularly popular 😄)