Generatorexp support

[Zehen-249]

Pull Request description

Solve #199

Pull Request checklists

Note:

• Share updated images of the graph representation of the new ASTx node
  proposed in this PR, in both image and ASCII formats. For more
  information, check this Google Colab notebook:
  https://colab.research.google.com/drive/1xXwHmOMkJKFSmhRvn4WYfSAsdDzMnawf?usp=sharing

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

TREE Representation

String representation

passes all test case

Reviewer's checklist

Copy and paste this template for your review's note:

## Reviewer's Checklist

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

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[xmnlab]

@Zehen-249 , please rebase your branch on top of the upstream/main.
so I can approve the CI workflow to be executed.

[github-actions]

This pull request has been marked as stale because it has been
inactive for more than 5 days. Please update this pull request
or it will be automatically closed in 5 days.

[xmnlab]

this pr is already stale for a week, so I am closing it now.
thanks @Zehen-249.
if you still want to work on that. I recommend you to start a new PR, because we made big changes in the core, so probably it would be easy to start from a new branch on top of the upstream main.

[Zehen-249]

I saw the changes in the recent development and I think I will create a new PR that would be easier to go forward. Thank you @xmnlab