Potentially inaccurate surrogate pair detection

@HansMuller [brought up](https://github.com/flutter/flutter/pull/53381#discussion_r440470378) that our _isUtf16Surrogate method in text_painter.dart is potentially inaccurate.  See the [Wikipedia definition of surrogate pair](https://en.wikipedia.org/wiki/UTF-16#Code_points_from_U+010000_to_U+10FFFF).

https://github.com/flutter/flutter/blob/248d746575b713da74144750527356a1c0095546/packages/flutter/lib/src/painting/text_painter.dart#L603

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Potentially inaccurate surrogate pair detection #59513

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Potentially inaccurate surrogate pair detection #59513

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