Provide OmegaConf syntax as option for --params

[merelcht]

Description

Provide OmegaConf syntax as second option for CLI --params. Still have Kedro syntax as default + deprecation warning and then replace in 0.19.0.

Context

Currently, Kedro has its own custom syntax and logic for passing parameters in the CLI. We can simplify this by leveraging OmegaConf, which we're also going to use in the configloaders instead of anyconf: #1868

Possible Implementation

Option 1:

Option 2:
Add a new boolean flag to support OmegaConf syntax: --new-style
kedro run --new-style --params ...

[szczeles]

That's a fantastic idea! In kedro-kubeflow and kedro-vertexai we struggled to pass inline parameters of complex types (list and dicts). It looks like OmegaConf.from_dotlist/from_cli can handle both nicely, no need to pre-create config.yaml before the run anymore.