Rename NodeHash to FSTSuffixNodeCache + Javadoc improvement #13259
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Description
Rename NodeHash to FSTSuffixNodeCache as NodeHash is rather an obscured name which doesn't tell its exact functionality. I also added the class Javadoc to explain what it is for and how it works, so that it would be easier to follow-up its implementation details (which I often struggled when working on it the first time).