feat: 能否增加一个冻结首行功能

[h2ls]

Excel Type

• [true] XLSX
• [true] XLSM
• [ ] CSV
• [ ] OTHER

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Please attach your issue file by dragging or droppng, selecting or pasting them.

e.g : https://github.com/shps951023/MiniExcel/files/6538107/demo.xlsx

MiniExcel Version

Description

希望可以增加一个冻结首行的功能！