Extended output for schema validation

[newLoki]

PR Description

Currently the output of the schema validation command only shows the issue, but gives no further description where exactly it appears. This pull request will at least show which element, meaning column definition, is causing the validation issue to be able to find a quicker solution.

Even better would be to show the table + column that is affected, but the information which table is validated is not available in the check.

Checklist

• I agree with the Code Contribution License Agreement in CONTRIBUTING.md

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