[libSyntax] Reenable caching of token nodes #18684
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If we accept that two token nodes in the same syntax tree can have the same
NodeIdif they have the same content and trivia, we can enable caching of token nodes again.As a side effect this will also speed up the transfer of a syntax tree to the client side since two tokens that are exactly the same will receive the same ID and thus will only be transferred once if incremental syntax tree transfer is enabled.