Expose font descent in Litho Text Spec

[edwardfoux]

Summary

This will allow us to extract font specs in Elements TextComponentSpec for calculating baseline last height by reflection:

Field field = Text.class.getDeclaredField("measuredLineDescent");
TextPaint paint = (TextPaint) field.get(textComponent);

Changelog

Expose font descent in Litho Text Spec

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[vinc3m1]

bump?