Fix bugs in msr_sqa dataset
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It shows below when I run test:

FAILED tests/test_dataset_common.py::LocalDatasetTest::test_load_dataset_all_configs_msr_sqa - ValueError: Unknown split "validation". Should be one of ['train', 'test'].

It make no sense for me😂. 
 @albertvillanova Does this PR has some additional fixes compared to https://github.com/huggingface/datasets/pull/3771 or we can close it? @mariosasko besides the fix of the DuplicatedKeysError, this PR:
- changes the reading of one of the files: use pandas instead of splitting by comma
- changes the splits: modifying train and adding validation
- adds some extra logic in the processing of the data: adding a new field "question_and_history"

We should decide whether validating these additional changes.
- for example, if we accept as pertinent the addition of the field "question_and_history", this should be added as feature to the info, and the matadata should be regenerated... Hi guys, anything we can do to fix that bug👀? @mariosasko @albertvillanova @lhoestq  _The documentation is not available anymore as the PR was closed or merged._
The last version has many problems,

1) Errors in table load-in. Split by a single comma instead of using pandas is wrong.
2) id reduplicated in _generate_examples function.
3) Missing information of history questions which make it hard to use.

I fix it refer to https://github.com/HKUNLP/UnifiedSKG. And we test it to perform normally.
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