Change an array to a vector

[EstherWx]

Member 'IterativeParsingReaderHandler::Logs' is not initialized in the constructor and it's hard to initialize an array in the old version of Vsiual Studio. Change it to a vector and remove the need for LogCapacity and LogCount as separate members.

Move the const static variables out from the template struct 'IterativeParsingReaderHandler' to solve 'undefined reference for LOG_*' link errors.

[tencent-adm]

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