Add method to convert non-shared Collection/SourceCache to shared variants
#541
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This allows for opting in to sharing after construction. Which is useful when accepting an existing
FontContext/Collection/SourceCachewhich you then want to "fan out" into thread-local shared clones.Blitz is using the method on
SourceCache, but is using non-sharedCollections. But both methods are included in this PR for symmetry.