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* Support bigbench-hard json tasks using multiple_choice_grade

* Add support for greedy decoding in bigbench tasks

* move bigbench_resources to datasets

* rectify changes to rf.greedy_until w upstream

* make path to resource import reflect new location

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Co-authored-by: haileyschoelkopf <hailey.schoelkopf@yale.edu>

This reverts commit 5fe7e2c0, reversing
changes made to 14b8ec7e.

Following the official implementation, the following changes were made
 - Validated answers are considered gold answers
 - EM/F1 are the max over all gold answers