refactor: Change AST types from class type to instance

[xmnlab]

Pull Request description

This PR aims to normalize the usage of AST Types for data types, moving from using Class as values to the instance of the classes.

Additionally, this PR fixes the usage of some data types classes and tests.

How to test these changes

• ...

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more
  complexity.
• New and old tests passed locally.

Additional information

Reviewer's checklist

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## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved .

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[github-actions]

🎉 This PR is included in version 0.16.1 🎉

The release is available on:

• 0.16.1
• GitHub release

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