Add CLI for running the project from anywhere

[Lucs1590]

Add a command-line interface (CLI) to run the script from anywhere on the computer and update the documentation.

• setup.py: Create a setup.py file to define the package and entry point for the command-line script.
• README.md: Update installation instructions to include pip install . and add instructions for running the script using the command strava-to-trainingpeaks. Include sections for common issues, additional examples, and scenarios.
• src/main.py: Enhance logging, add specific error messages, and create an interactive setup script for initial configuration. Use the argparse module to define and parse command-line arguments. Implement validation checks for user inputs, provide detailed help messages, and implement robust error handling. Add a retry mechanism for network errors during file downloads and a progress bar for long-running tasks. Include a command to reset the configuration to default settings.
• requirements.txt: Add setuptools to the requirements.txt file.
• tests/test_main.py: Add tests for new functionalities in src/main.py, including cross-platform compatibility, retry mechanism, progress bar, and resetting the configuration.

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