chore!: rename package, restructure files, and add pip integration

[Bjarten]

This update introduces significant changes to the project, including renaming the package, restructuring the directory, and setting up automated publishing to PyPI using API tokens.

Key Changes:

1. Package Renaming:

   • The package has been renamed from pytorchtools to early_stopping_pytorch for clearer naming and better alignment with its functionality.

2. Directory Restructuring:

   • Project files have been reorganized for clarity, with the source code placed under the early_stopping_pytorch/ directory in the root of the project.

3. PyPI Integration:

   • Added support for automated publishing to PyPI using GitHub Actions.
   • API tokens are used for secure publishing, stored as GitHub Secrets (PYPI_TOKEN).

Impact:

• Breaking Changes: Users will need to update their import paths from:

  from pytorchtools import EarlyStopping

  to:

  from early_stopping_pytorch import EarlyStopping

• New versions will be automatically published to PyPI when a new tag is pushed, using the API token for authentication.