GitLab

* allow tasks to specify printed fewshot val

* fix to belebele

* update metadata field's documentation

* fix incorrect lookback protections

* bump generate_until task versions

* change version field formatting in metadata

* mention versioning in new task guide

* add instructions for changelog

* run linters

BBH cot fewshot already has fewshot examples in the description. So num_fewshot needs to be set to 0 so that users won't mistakenly set other num_fewshot values.