ovos-classifiers is still in pre-alpha and wont have a stable release anytime soon, make it an optional dependency of ovos-core 0.0.8

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

```
2024-08-04 01:46:56.692 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:269 - DEBUG - Tied skills: ['skill-ovos-ddg.openvoiceos', 'skill-ovos-wikipedia.openvoiceos', 'skill-ovos-wolfie.openvoiceos']
2024-08-04 01:46:56.693 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:275 - DEBUG - ReRanking answers from skills
2024-08-04 01:46:56.974 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:280 - INFO - ReRanked score: 0.9994009733200073 - {'phrase': 'what is the speed of light', 'skill_id': 'skill-ovos-ddg.openvoiceos', 'answer': 'The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second.', 'handles_speech': True, 'callback_data': {'query': 'what is the speed of light', 'answer': 'The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second.'}, 'conf': 2.229565217391304}
2024-08-04 01:46:56.975 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:280 - INFO - ReRanked score: 0.9994009733200073 - {'phrase': 'what is the speed of light', 'skill_id': 'skill-ovos-wikipedia.openvoiceos', 'answer': 'The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second .', 'handles_speech': True, 'callback_data': {'query': 'what is the speed of light', 'image': 'https://upload.wikimedia.org/wikipedia/commons/2/2e/Earth_to_Sun_-_en.png', 'title': 'Speed Of Light', 'answer': 'The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second .'}, 'conf': 2.1133333333333333}
2024-08-04 01:46:56.975 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:280 - INFO - ReRanked score: 0.9967312812805176 - {'phrase': 'what is the speed of light', 'skill_id': 'skill-ovos-wolfie.openvoiceos', 'answer': 'The speed of light has a value of about 300 million meters per second', 'handles_speech': True, 'callback_data': {'query': 'what is the speed of light', 'answer': 'The speed of light has a value of about 300 million meters per second'}, 'conf': 2.8085714285714287}
2024-08-04 01:46:56.975 - skills - ovos_core.intent_services.commonqa_service:_query_timeout:287 - INFO - Handling with: skill-ovos-ddg.openvoiceos
```

add "ignore_skill_scores" config option, rely on the reranker for best answer selection while ignore self reported confidence by skills