In NoiseSensitivity, the `.` should be deleted as the split condition.

[jiajunly]

[ ] I checked the documentation and related resources and couldn't find an answer to my question.

Your Question
After the sentence is split, i think the . should no longer be used as a split condition. Many other languages ​​do not use . as a split condition. Just follow the result of sentence_segmenter.

Code Examples
https://github.com/explodinggradients/ragas/blob/main/src/ragas/metrics/_noise_sensitivity.py#L104C13-L104C46

Additional context
I will provide a pr.