feat: Add excel and excelMulti support

[dradoudine]

This commit adds support for excel and excelMulti reports.

It introduces a new Tabular abstract class to share code between the CSV, excel and excelMulti providers.

The excel and excelMulti providers use Apache POI to parse excel files.

The TabularParser has been modified to use the cell type to identify numeric values.

I was unable to get the tests to pass. The TabularParser is not correctly identifying the numeric values in the Excel files. I have tried several approaches to fix this issue, including using NumberUtils.isCreatable, regular expressions, and NumberUtils.isParsable. None of these approaches have worked. I have also tried to debug the issue by adding logging statements to the code.

My last attempt was to use the cell type to identify numeric values. I have modified the TabularParser to accept a list of cell types, and I have modified the ExcelParser to pass the cell types to the TabularParser. However, this has resulted in a compilation error. I have fixed the compilation error, but the tests are still failing.

Testing done

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