feat: modifiers in spec

[tilucasoli]

Related issue

#313

Description

Add the ability to set modifiers in specs.

Changes

• Add modifiers as an attribute of Spec;
• Add the ability to set modifiers in specs;
• Change the default way to reorder modifiers, now it should be a Spec instead of Attribute;
• Deprecate some attributes of RenderModifiers;
• Create a directory, which will group the old tests to ensure doesn't exist breaking changes.

Review Checklist

• [x] Testing: Have you tested your changes, including unit tests and integration tests for affected code?
• [ ] Breaking Changes: Does this change introduce breaking changes affecting existing code or users?
• [ ] Documentation Updates: Are all relevant documentation files (e.g. README, API docs) updated to reflect the changes in this PR?
• [ ] Website Updates: Is the website containing the updates you make on documentation?

Additional Information (optional)

I tried not to create breaking changes, let me know if you have any doubts about some modifications.

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
mix-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 11, 2024 3:01pm

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DCM report

❌ warning issues: 1

Full report: https://github.com/conceptadev/mix/runs/26769029694

[tilucasoli]

@leoafarias do you think we should create a document for this migration now?