@param u A pointer to a UTF-8 string. The pointer must remain valid, and
the content unchanged, for the lifetime of the neo4j value.
@param n The length of the UTF-8 string. This must be less than
UINT32_MAX in length (and will be truncated otherwise).
@return A neo4j value encoding the String.
Construct a neo4j value encoding a string.
@param u A pointer to a UTF-8 string. The pointer must remain valid, and the content unchanged, for the lifetime of the neo4j value. @param n The length of the UTF-8 string. This must be less than UINT32_MAX in length (and will be truncated otherwise). @return A neo4j value encoding the String.