[Quest] Move The Tenshodo Showdown mob code

[jamesbradleym]

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• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Adds onSteal to IF
Moves npc code handling onSteal for the THF AF1 quest into the quest lua

Steps to test these changes

Steal from Quadavs during THF AF1 quest, see unchanged results.

Notes

Some players indicated they could steal the stew prior to flagging the quest:
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[claywar]

onSteal is not currently observed by Interaction.

[jamesbradleym]

onSteal is not currently observed by Interaction.

I swear when I tested I got the stew item but now I'm not getting it..

[jamesbradleym]

@claywar Looks like it worked because the stew is already in the mob_droplist steal section, this makes the whole onSteal escapade unnecessary?

[claywar]

The way to verify this is to see if quadav stew can be stolen by people not on the quest (I'm betting this is no).

[jamesbradleym]

Ah, and in that case it would need to be removed from the drop list + onSteal implemented for IF. 👍🏻

[jamesbradleym]

As a note: Yes you can steal the stew prior to quest start, but stew seems to be prioritized for those currently on the quest per player reports on wikis

[jamesbradleym]

@claywar I've made the necessary updates for onSteal to be recognized in IF, would you mind taking a look to make sure this is following the right pattern? Took a look at how onTrigger and onTrade operate in IF to put together onSteal so hopefully it's clear cut.

Tested with the quest and on successful steal the onSteal in the quest lua is called and returns the Quadav Stew to be given to the player