add templates for riddle_sense dataset

[JonnodT]

Use almost identical templates as commonsense_qa because the two datasets are very similar.

@yuchenlin

[VictorSanh]

thanks for contributing these @JonnodT !

I ran the tests locally and they passed (I pushed an update on the tests earlier cause they were failing automatically)

I moved the conditional statement on answerKey to the target

[yuchenlin]

@VictorSanh Thank you!