Use SLF4J for javahg internal logs

[eheimbuch]

Proposed changes

Use own logger for mercurial internal commands. This prevents log overflow by javahg's JULLogger.

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• Feature has been tested with different permissions
• Documentation updated (only necessary for new features or changed behaviour)

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• The clean code principles are respected (CleanCode)
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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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