Add testing framework for Python

[ronaldtse]

Port tests from Ruby to Python.

d_tests = [{'original' => '# گيله پسمير الجديد 34',
            'diacritized' => 'يَلِهُ سُمِيْرٌ الجَدِيدُ',
            'reconciled' => '# گيَلِهُ پسُمِيْرٌ الجَدِيدُ 34' },

           {'original' => 'abc',
            'diacritized' => '',
            'reconciled' => 'abc'},

           {'original' => '‘Iz. Ibrāhīm as-Sa‘danī',
            'diacritized' => '',
            'reconciled' => '‘Iz. Ibrāhīm as-Sa‘danī'},

           {'original' => '26 سبتمبر العقبة',
            'diacritized' => 'سَبْتَمْبَرِ العَقَبَة',
            'reconciled' => '26 سَبْتَمْبَرِ العَقَبَة'}]

d_tests.each {|d| \
    if not d['reconciled']==reconcile_strings(d['original'], d['diacritized'])
        raise Exception.new('reconcile string not matched')
    end
}

or:
for s in '# گيله پسمير الجديد 34' 'abc'  '‘Iz. Ibrāhīm as-Sa‘danī' '26 سبتمبر العقبة'
do;
    ruby rababa.rb -t $s -m '../models-data/diacritization_model.onnx'
done
``

[ronaldtse]

We should copy/paste the tests from Ruby here.