vdk-core: add logging plugin warning and check if the vdk-structlog plugin is used #2944
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What: This is part of #2813 which is addressed by #2939. Add logging plugin warning and check if the vdk-structlog plugin is used by checking the dedicated env var VDK_USE_STRUCTLOG.
Why: To notify the user about the logging configuration changes and to guide them to use vdk-structlog instead.