Add tracking for Choofa's Call (?)

[rdw-software]

Source: Discord Item: https://www.wowhead.com/item=187705/choofas-call

This might be a rare drop from Shadowlands? Not sure if it has any special requirements or why it wasn't added back then.

Rarity would have to track this world object: https://www.wowhead.com/object=350978/queens-conservatory-cache