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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integrationtests/test_data/extroot/use_case_simple_presentation/cfood.yml

@@ -68,8 +68,8 @@ extroot:
               parents:
                 - mdfile
               role: File
-              path: $DataFile
-              file: $DataFile
+              path: $DataFile_path
+              file: $DataFile_path
 
             Experiment: {}