Add standardized sources and targets definitions across dataset modules

[amir9667]

This pull request introduces definition and integration of class-level sources and targets for the affected dataset modules.
references to cfg have been removed and replaced with static, structured access through DatasetSources and DatasetTargets.

Key Changes

1- Added fully structured sources and targets attributes to each updated dataset class.
2-Replaced all cfg[...] usages with direct references to
ClassName.sources.files[...],
ClassName.sources.tables[...], or
ClassName.targets[...].

🧑‍💻 Contributor Checklist

Before requesting a review, make sure you've completed all of the following:

• All tests pass locally or via CI
• (for more information on local test, check tox in the Contributing section)
• (CI tests are automatically executed when creating a PR, you can see the results of the checks below)
• Workflow has run at least once in Test mode
• (optional if no dataset changes are involved)
• Relevant documentation is updated (API, new features, etc.)
• Dataset-versions are updated when existing datasets are adjusted.
• Added a note to CHANGELOG.rst about the changes
• Added yourself to AUTHORS.rst

Optional:

• Changes have been tested in Everything mode
• Extend the checklist for reviewers: Which aspects should be reviewed in particular?

🔍 Reviewer Checklist

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• Is the code clean, readable, and efficient? Are there any oddities or obvious inefficiencies?
• Does the code work as expected? (should already be verified by contributor)
• Do all tests pass? (see CI results)
• Is the documentation complete and up to date?
• Is CHANGELOG.rst updated accordingly?
• Is all necessary metadata complete and correct?
  - [ ] If metadata is pending: Is there an appropriate issue filed?