Create a `Table` from an Excel file

[lars-reimann]

Is your feature request related to a problem?

Tabular data is often stored in Excel files. We are currently not able to create a Table from them directly.

Desired solution

Add a new method to the Table class:

class Table:
    @staticmethod
    def from_excel_file(path: str) -> Table:
       ...

Possible alternatives (optional)

No response

Screenshots (optional)

No response

Additional Context (optional)

• For now, we use the first row as the column names.
• If Methods that operate on files should be able to handle a Path too #146 is done before this, path should have type str | Path.