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Description of feature request

Got a stone pickaxe? Enjoy the Wither Storm!

While there's a config to automatically summon the Wither Storm after a certain amount of time, I think a config option to summon the Wither Storm if the player gets a certain advancement would be interesting.

Example: The Wither Storm appears after the player gets the advancement "Cover Me in Diamonds".

With the config of being summoned upon a certain amount of time, you basically have to scramble and get as much resources before the storm arrives. This may not be possible to achieve within the time limit, given that many resources can be limited depending on the seed the player spawns in.

But with the config to summon the WS via a certain advancement, it's more flexible. The time it can take to reach the advancement will vary on the player, but as long as the player gets to the advancement, then it tells the mod that the player has gotten to a point where the player is properly prepared against the WS.

This new config can also benefit modpack makers, as some mods have advancements of their own. Having the WS summoned through advancements can tie the WS a little more in other modpacks, timing them perfectly with other potential disasters (Like Sculk Horde and Fungal Infection: Spore).