fix(event structure): round values in settratr

[unitrium]

Issue

We currently don't have a consistent way of initializing attributes. They are rounded when using the add_value method and not rounded if using __setattr__ directly.

Description

Use the same proceding for both add_value and settatr so they are now consistent.

Double check

• I have tested my parser changes locally with poetry run test_parser "zone_key"
• I have run pnpx prettier --write . and poetry run format to format my changes.

[github-actions]

PR Analysis

• 🎯 Main theme: This PR aims to ensure consistency in the initialization of attributes by rounding values in both the add_value method and __setattr__.
• 📝 PR summary: The PR modifies the add_value and __setattr__ methods in the Mix class to ensure that values are rounded consistently. The __setattr__ method is overridden to round the value and the add_value method is updated to remove the rounding, as it will now be handled by __setattr__.
• 📌 Type of PR: Bug fix
• 🧪 Relevant tests added: No
• ⏱️ Estimated effort to review [1-5]: 2, because the changes are straightforward and limited to a single class. However, the lack of tests increases the review effort slightly.
• 🔒 Security concerns: No

PR Feedback

• 💡 General suggestions: It's good that you have made the attribute initialization consistent across methods. However, it would be beneficial to add tests to verify the correct behavior of these changes. This will ensure that the rounding is working as expected and will prevent potential regressions in the future.

• 🤖 Code feedback:

  ---

  relevant file	electricitymap/contrib/lib/models/events.py
  suggestion	Consider adding a check to ensure that the value being set is indeed a float or None before rounding it. This will prevent potential errors if a non-float value is accidentally passed. [important]
  relevant line	return super().__setattr__(name, _none_safe_round(value))

  ---

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