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[Parquet] Expose ReadPlan and ReadPlanBuilder #8347

@yeya24

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@yeya24

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Currently, ReadPlan and ReadPlanBuilder are only public within crate and are used to create ParquetRecordBatchReader or ParquetRecordBatchStreamReader to read parquet file data. For usecases that don't want to reuse ParquetRecordBatchReader and ParquetRecordBatchStreamReader but still want to utilize ReadPlan to access Parquet files, there is no way to do that today.

Describe the solution you'd like

Expose ReadPlan and ReadPlanBuilder as publicly available so that users can construct their own reader on top of ReadPlan and ReadPlanBuilder.

Describe alternatives you've considered

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    enhancementAny new improvement worthy of a entry in the changelogparquetChanges to the parquet crate

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