[Surprise Exam] Add support to signal to users about ::exportexampuzzle command

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Currently, people won't know about ::exportexampuzzle to help with incorrect puzzle solutions unless they bother to read the README and remember the command. It would be better to add support for say, sending a game message, to let the user know about the command when they complete a puzzle incorrectly.

After getting a next missing item puzzle wrong:
[Client] DEBUG c.g.weaponcharges.DialogTracker - dialog changed: DialogState{NPC, name='Mr. Mordaut', text='No, no, no...<br>That's WRONG!<br>Okay, next question.'} previous: DialogState{NO_DIALOG} (game tick: 84711)

After getting a matching cards puzzle wrong:
[Client] DEBUG c.g.weaponcharges.DialogTracker - dialog changed: DialogState{NPC, name='Mr. Mordaut', text='No, no, no...<br>That's WRONG!<br>Okay, next question.'} previous: DialogState{NO_DIALOG} (game tick: 85261)

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Another one that appeared after a next missing item puzzle

2026-01-19 01:24:38 EST [Client] DEBUG c.g.weaponcharges.DialogTracker - dialog changed: DialogState{NPC, name='Mr. Mordaut', text='No.
No, that's not right at all.
Okay, next question.'} previous: DialogState{NO_DIALOG} (game tick: 19577)

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Current known dialogue options: https://oldschool.runescape.wiki/w/Transcript:Mr._Mordaut

Question 1 Failures:
- No. No, that's not right at all. Okay, next question.
- That's WRONG. Take your time and think about the next question.
- No, no, no... That's WRONG! Okay, next question.
- How unfortunate, you FAILED. You'd better hit the books and study up for next time.
- Last attempt and failed