F fix strict values in table columns

Summary

For https://gitlab.indiscale.com/caosdb/customers/geomar/management/-/issues/152. The TableImporter.check_datatype function is now less strict (by default) with numeric values in columns that are expected to have string values.

Focus

There had been already a strict option but it was only used for float columns containing integer values. This was extended.

Test Environment

No manual testing is needed, unit tests should be sufficient.

If you still want to test it manually, run the Geomar server-profile with this branch and use, e.g., an integer in the "Storage ID" column of the sample upload.

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