EasyPororoOCR Integration

[junhoyeo]

Closes #2

• Make basic text detection using EasyOCR, Pororo (EasyPororoOCR), and Tesseract work
• Box detection
• Refactor structure
• Make it optional (i.e. Activate only if lang is en or ko)
  • TBD: Also support overriding activated engines though options
  • Dependencies for EasyPororoOCR should also be optional via Poetry groups
• Cite original authors
• TBD: Use pre-processing logic on other engines too? + Evaluation

[black7375]

Thanks. looks good.