Added support for itwinai>=0.3

[matbun]

Summary

From itwinai 0.3 we migrated to Hydra for config management, as the previous solution based on jsonargparse sometimes generated error traces difficult to understand for non-experts. The configuration files remain pretty much the same, but there is some change in the structure and in how we dynamically override fields from the CLI.

Changes:

• updated config file
• fixed versions for the dependencies in the pyproject.toml file. This should give more control on what gets installed. (I have also shamelessly added myself in the authors, but you can remove me).
• updated docs in the README

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