Enhance DataCollatorForLanguageModeling with Configurable Token Replacement Probabilities (#35251)
* DataCollatorForLanguageModeling class was updated with new parameters that provides more control over the token masking and relacing
* DataCollatorForLanguageModeling class was updated with new parameters that provides more control over the token masking and relacing
* Addressed review comments, modified the docstring and made a test for the DataCollatorForLanguageModeling