GitLab

* Add MLQA
* add mlqa_common_yaml

* add 49 tests of mlqa family

* update tasks/README.md

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* fix: mlqa ast error

* nit: removed .yaml ext from template_yaml

* nit changes: minor modifications generate_tasks.py

* deleted    lm_eval/tasks/mlqa/mlqa_common_yaml.yaml

* tests updated

* nit