[python] Support row-count based file rolling for data-evolution append tables

[XiaoHongbo-Hope]

Purpose

#8739 added row-count based data file rolling (target-file-row-num) on the core side. PyPaimon file-store writers previously did not support it and failed fast whenever the option was enabled.

This PR implements target-file-row-num rolling for data-evolution append tables in PyPaimon.

Changes

• DataWriter._check_and_roll_if_needed: roll a file when it reaches target-file-row-num rows or target-file-size, whichever comes first (exact slicing, mirroring the format-table path). Defaults to the max long (disabled), so size-based rolling is unchanged when the option is unset.
• FileStoreWrite._create_data_writer: narrow the fail-fast so the option is permitted only for data-evolution append tables (i.e. AppendOnlyDataWriter — not primary-key, blob or vector writers, which override rolling and remain unsupported for now).

Tests

data_evolution_row_rolling_test.py:

• rolls when the row count exceeds the limit (10 rows / limit 3 → files of 3,3,3,1);
• exact multiple rolls evenly;
• below the limit stays a single file;
• unset option does not roll by rows;
• a non-DE table still fails fast.