PARQUET-2438: Fixes minMaxSize for BinaryColumnIndexBuilder

[ConeyLiu]

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This fixes the minMaxSize calculation for BinaryColumnIndexBuilder since the min/max value can be truncated.

[ConeyLiu]

@wgtmac @gszadovszky @shangxinli could you help to review this? Thanks a lot.

[wgtmac]

Could you rebase it?

[ConeyLiu]

rebased