bug fix packaging + fix printing with deletion of `str()`

[bleudev]

closes #31

Summary by Sourcery

This pull request fixes import path issues, removes the __str__ method from the UDict class, updates the setup.py configuration, and enhances documentation. Additionally, a new script for uploading to TestPyPI has been added.

• Bug Fixes:
  • Fixed import paths in multiple modules to use absolute imports instead of relative ones.
• Enhancements:
  • Removed the __str__ method from the UDict class, relying solely on the __repr__ method for string representation.
• Build:
  • Updated setup.py to include the typ subpackage in the list of packages.
  • Cleared the install_requires list in setup.py.
• Documentation:
  • Updated examples/udict.md to remove references to the str() method and clarify the usage of repr() in print statements.
• Chores:
  • Added a new script upload_testpypi.bat for uploading the package to TestPyPI.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request addresses bug fixes related to packaging and printing functionality by removing the str() method from UDict, updating import paths, and modifying the setup script. Additionally, a new batch script for uploading to TestPyPI is added.

File-Level Changes

Files	Changes
ufpy/udict.py ufpy/ustack.py ufpy/typ/type_alias.py ufpy/utils.py	Updated import paths to use absolute imports for better package structure.

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