Restrict helper classes in ScriptListener for internal use

[daniel-beck]

While they might be useful for anyone needing to call #fire... methods, that alone is fairly unlikely to be necessary.

See #7056 (comment)

Testing done

None

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None

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N/A

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[jglick]

The fire* methods are supposed to be public?

[NotMyFault]

/label ready-for-merge

---

This PR is now ready for merge. We will merge it after ~24 hours if there is no negative feedback.
Please see the merge process documentation for more information about the merge process.
Thanks!

[daniel-beck]

The fire* methods are supposed to be public?

Do you mean unrestricted? I don't see why not.

[jglick]

Fine, just checking.