Auto-labeling-pipeline

Add GCP image label detection

- https://github.com/doccano/auto-labeling-pipeline/pull/9 Fix the method finds the RequestFactory

- Update remove_overlapping function, fix https://github.com/doccano/doccano/issues/1221

- Allow users to specify localhost on Custom Rest Request https://github.com/doccano/auto-labeling-pipeline/pull/5

- Support Python3.6
- Add new templates
- Amazon Comprehend Entity Recognition
- Amazon Comprehend PII Entity
- Add types for each model
- Add label merge feature
- Remove `request.py`

- Add description field to Option model
- Fix the method to replace text in the dictionary