Update kadet input type to use external kadet module

[ramaro]

Update kadet input type to use external kadet module as it is now available at https://pypi.org/project/kadet/

This will introduce breaking changes to BaseObj's methods:

• to_dict() to be renamed to dump()
• update_root() to be renamed to root_file()

cc @ademariag @Moep90 these changes will break https://github.com/kapicorp/kapitan-reference

[Moep90]

Do we have to update the suggested changes here as well kap_0_kadet.md?

[ramaro]

Do we have to update the suggested changes here as well kap_0_kadet.md?

Yes, we will need to indeed! Once a release is done

[ademariag]

@ramaro kapicorp/kapitan-reference should work now with the new version

[github-actions]

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