Add MLQA (#2622)

* 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

lm_eval/tasks/mlqa/mlqa_en_en.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_en_en
+dataset_name: mlqa.en.en
+process_results: !function utils.process_results_en

lm_eval/tasks/mlqa/mlqa_en_es.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_en_es
+dataset_name: mlqa.en.es
+process_results: !function utils.process_results_en

lm_eval/tasks/mlqa/mlqa_en_hi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_en_hi
+dataset_name: mlqa.en.hi
+process_results: !function utils.process_results_en

lm_eval/tasks/mlqa/mlqa_en_vi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_en_vi
+dataset_name: mlqa.en.vi
+process_results: !function utils.process_results_en

lm_eval/tasks/mlqa/mlqa_en_zh.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_en_zh
+dataset_name: mlqa.en.zh
+process_results: !function utils.process_results_en

lm_eval/tasks/mlqa/mlqa_es_ar.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_ar
+dataset_name: mlqa.es.ar
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_de.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_de
+dataset_name: mlqa.es.de
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_en.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_en
+dataset_name: mlqa.es.en
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_es.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_es
+dataset_name: mlqa.es.es
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_hi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_hi
+dataset_name: mlqa.es.hi
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_vi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_vi
+dataset_name: mlqa.es.vi
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_es_zh.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_es_zh
+dataset_name: mlqa.es.zh
+process_results: !function utils.process_results_es

lm_eval/tasks/mlqa/mlqa_hi_ar.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_ar
+dataset_name: mlqa.hi.ar
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_de.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_de
+dataset_name: mlqa.hi.de
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_en.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_en
+dataset_name: mlqa.hi.en
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_es.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_es
+dataset_name: mlqa.hi.es
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_hi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_hi
+dataset_name: mlqa.hi.hi
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_vi.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_vi
+dataset_name: mlqa.hi.vi
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_hi_zh.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_hi_zh
+dataset_name: mlqa.hi.zh
+process_results: !function utils.process_results_hi

lm_eval/tasks/mlqa/mlqa_vi_ar.yaml

+# Generated by generate_tasks.py
+include: mlqa_common_yaml
+task: mlqa_vi_ar
+dataset_name: mlqa.vi.ar
+process_results: !function utils.process_results_vi