fix(source): parquet file source use number of rows to determine the end of the file reading

[wcy-fdu]

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What's changed and what's your intention?

For parquet file source, we use RecordBatchStream to read parquet file, and it's offset represents the current row read, not the bytes. The fetch executor determines whether a file has been read completely by comparing the offset with the file size, where the file size is obtained during the list process.

This pr modifies the semantics of the size of OpendalFsSplit in the parquet file, expressing it as the total number of rows in a parquet file. Specifically, before constructing OpendalFsSplit each time a file name is obtained, the metadata of the parquet file is read to obtain the total number of rows.

Todo:

• add more comments
• error handling

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[tabVersion]

LGTM

[hzxa21]

Left some minor comments. Rest LGTM