Handle surrogate pairs in jest-diff's diffStrings

[gofr]

Summary

String slicing and indexing treats strings as sequences of UTF-16 code units. That makes diffStrings() break apart surrogate pairs.

Turn the strings to diff into arrays of code points to avoid that.

Test plan

Add a test for a surrogate pair. And also add tests for some other Unicode text segmentation edge cases for completeness.

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commit: 2932e57