Add resourcehandlerinfo creation management command

[mattiagiupponi]

Checklist

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[gemini-code-assist]

Code Review

This pull request introduces a new Django management command, fixup_resourcehandlerinfo.py, designed to generate missing ResourceHandlerInfo for Dataset objects based on their subtype. It also updates the 0046_dataset_migration.py to incorporate similar logic for datasets that lack associated files. The review identifies a critical issue in both the new command and the migration: the handler_module_path is incorrectly set using the string representation of a handler instance rather than its proper class module path, which could lead to incorrect behavior. Furthermore, the logging configuration in the new management command is noted as an area for improvement, as it directly modifies the root logger, potentially causing conflicts with Django's default logging setup.