* Reformer model head classification implementation for text classification
* Reformat the reformer model classification code
* PR review comments, and test case implementation for reformer for classification head changes
* CI/CD reformer for classification head test import error fix
* CI/CD test case implementation added ReformerForSequenceClassification to all_model_classes
* Code formatting- fixed
* Normal test cases added for reformer classification head
* Fix test cases implementation for the reformer classification head
* removed token_type_id parameter from the reformer classification head
* fixed the test case for reformer classification head
* merge conflict with master fixed
* merge conflict, changed reformer classification to accept the choice_label parameter added in latest code
* refactored the the reformer classification head test code
* reformer classification head, common transform test cases fixed
* final set of the review comment, rearranging the reformer classes and docstring add to classification forward method
* fixed the compilation error and text case fix for reformer classification head
* Apply suggestions from code review
Remove unnecessary dup
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
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