[IOTDB-5055] Make SeriesScanOperator put enough data into TsBlock and then return

[liuminghui233]

TsBlock init takes much time, so we should let each TsBlock large enough to make its initialization cost overhead as small as possible.

However, when there exists too many unseq tsfiles, it will cause ScanOperator return small TsBlock(containing like 1 or 2 lines) which reduces the query performance.

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