Add rolla for dice completion

[Salanto]

Add Tsu3s rolla command for effect dice usage.

[Samevi]

Bumping - just encountered players who still run a private server on tsuserver3 exclusively because of the missing rolla command.

[stonedDiscord]

so basically
https://github.com/AttorneyOnline/tsuserver3/blob/master/config_sample/dice.yaml

[stonedDiscord]

please test
https://github.com/AttorneyOnline/akashi/actions/runs/12355173426

[Samevi]

The command works. But:

• Sometimes it says "dice.ini is empty" in spite of dice.ini having the argued list.
• It never seems to choose the lowest possible value. I used /rolla default more than 100 times and never got returned "Stomach ulcer" as is the default value.

I'm lucky from time to time, but I know I'm not THAT lucky.