Use Interfaces/Classes to abstract dependencies and improve testability

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Possible interfaces:

• [x] GenAITextClient
  • generateText => (text, metadata)
• [x] GenAIImageClient
  • generateImage => (img, metadata)
• [ ] MetricsClient
  • putMetric => (success/fail)
  • getMetric => (metric, metadata)
• [x] DBClient
• [x] ObjectStoreClient

Other notes:

• Abstract classes

[CheriseCodes]

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