Fix the problem when executing fill_table twice

[LukasFehring]

Description

Fix issue form mentioned issue

Motivation and Context

Newer versions of mysql return table columns sorted alphabetically. Our previous codebases hardcoded checking whether the structure was correct, which does not work anymore.

Changes

Decide flexibly whether or not a table is of correct structure

Type Of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

How has This Been Tested?

• Database provider: mysql
• Python version: Any
• Operating System: Any

Instead of selecting relevant columns from the datbase to compare, all irrelevant coluns (such as start date) are deleted before comparing

Does this Close/Impact Existing Issues?

• Issue Problem when executing fill_table twice #167

What is Missing?

Nothin

Checklist

• My change is based on the latest stage of the develop branch.
• My change required a change of the documentation, which has been done.
• I checked that the documentation can be build, visualizes everything as expected, and does not contain any warnings.
• I have added/adapted tests to cover my changes.
• The tests can be executed successfully.
• The notebooks can be executed successfully.
• The notebooks can be executed with mysql as provider.
• I have added a description of the changes to CHANGELOG.rst.