:sparkles: add support for invoice splitter auto-extraction

[sebastianMindee]

Description

• :sparkles: add support for invoice splitter auto-extraction
• :recycle: rename image_extraction module to extraction
• :memo: add example for auto-extraction

Related Issue

How Has This Been Tested

Types of changes

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Requires a change to the official Guide documentation.