ENH: add the 'add_prefix' argument

Summary

Look at this after !100 (merged) is merged

In order to allow inserting files below some prefix (e.g. "/ExperimentalData") in the CaosDB file system, the "add_prefix" is added.

Focus

For consistency, the old "prefix" is removed and replaced by "remove_prefix"

Test Environment

There is an integration test. Test the deprication manually.

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