Make ScoreAccessor utility class publicly available for other script engines #6898
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With the removal of setNextScore in #6864, script engines must use
the Scorer to find the score of a document. The DocLookup is updated
appropriately to do this, but most script engines require a Number to be
bound for numeric variables. Groovy already had an encapsulation for
this funtionality, and this moves it out to be shared with other script
engines.