[Feature]: CSV Data Source with skipFirstRow should use row headings rather than row index

[cancan101]

Feature description

Currently the column index for a CSV file (with headings, i.e. skipFirstRow: true) is serialized such that if the column ordering changes, the import will fail.

Examples are idDataIndex and dataSourceIndex in the config.

The same issues applies to loading XLSX files.

The current config makes the loaders not robust to any sort of column additions / reordering.

[github-actions]

Thanks a lot for reporting the issue. We did not consider the issue as "Pimcore:Priority", "Pimcore:ToDo" or "Pimcore:Backlog", so we're not going to work on that anytime soon. Please create a pull request to fix the issue if this is a bug report. We'll then review it as quickly as possible. If you're interested in contributing a feature, please contact us first here before creating a pull request. We'll then decide whether we'd accept it or not. Thanks for your understanding.