Improved chain handling

What's Changed

• Fixed handling of finally within promise chains (#75).
• Improved rejection handling to resolve chains with a static value (#75).
• Fixed new issues in chain resolution, ensuring expected behavior (#75).
• Added tests to validate exception handling when catch is not configured.
• Began tests for unhandled promise rejections.
• Simplified and refactored complex and duplicated code for maintainability.

Full Changelog: v2.3.0...v2.4.0