Feature: Allow COPY FROM excel

[Xuanwo]

Summary

Excel (xls, xlsx, xlsm) is a widely used file format (maybe the most in the real world?). It's maybe interesting to read data from excel.

There are some crates in the community we can use:

• https://docs.rs/office/latest/office/
• https://github.com/tafia/calamine

[Xuanwo]

This issue should start after #7613