fix: callable specs and modifiers

[tilucasoli]

Description

Some fixes in call methods and modifiers structure

Changes

• Make WithModifierUtility a generic class and receive a builder in its constructor;
• Make callable specs have the same parameters as the spec widget constructor;
• Fix PaddingModifierAttribute merge.

Review Checklist

• 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?

Impacted Packages

Please indicate which packages in our project are affected by these changes:

• mix
• mix_lint
• mix_generator
• documentation

Additional Information (optional)

Looking at the WithModifierUtility changes, maybe it can be a breaking change in specific scenarios. What do you think @leoafarias?

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
mix-docs	⬜️ Ignored (Inspect)	Visit Preview		Jun 27, 2024 6:36pm

[github-actions]

DCM report

✅ no issues found!

Full report: https://github.com/conceptadev/mix/runs/26730908855