Synct

Small improvements:

- Handle Ctrl+C interrupting the script
- Google sheet error handling improvement
- Improvement of Google authorized access guidance

Bug fixes and improvements:

- Fix Bugzilla limit issue
- Refactoring and coding improvements
- Testing enhancements

Bug fixes and improvements:

- GitHub and GitLab operations refactoring and enable pagination
- Enable pagination for Bugzilla and Jira
- Google credentials and token improvement
- Cosmetic adjustments to unify the coding style
- Corrected xlsx example input file
- Update of README.md file

Bug fixes and code improvements:

- Improve Excel files error handling
- Enable pagination for GitLab
- Examples improvement
- Update of README.md file

Bug fixes and code improvements:

- Move versioning outside Python code
- Error handling improvement
- Resolving pandas warnings about deprecations
- Small code improvements