Add __slots__ to NodeClass classes

[autinerd]

Proposed change

This adds the __slots__ attribute to NodeStrClass, NodeListClass and NodeDictClass and adds the __config_file__ and __line__ attributes fixed to these classes, so they do not need to be added dynamically.

Needed for #115043

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[bdraco]

FAILED tests/components/todoist/test_calendar.py::test_update_entity_for_calendar_with_due_date_in_the_future[due0] - AssertionError: assert '2024-04-10 00:00:00' == '2024-04-11 00:00:00'

This test failure is unrelated. It seems to fail on day change over

[bdraco]

I'll test this one locally before merging

[bdraco]

We have a lot of RAM usage from these objects (enough that when we had the leak here it would very obvious) so its great to use more __slots__ here

[bdraco]

Thanks @autinerd