Add coding provider

[Josh-XT]

This pull request introduces a new CodingProvider class in the agixt/providers/coding.py file, which allows users to offload coding tasks to a specified coding provider while maintaining a default provider for other tasks.

Key changes include:

• New Class Introduction:

  • CodingProvider: A new class that allows users to specify a default provider and a separate coding provider for handling coding tasks. It includes methods for initializing the provider settings and performing inference based on the type of task.

• Error Handling:

  • Enhanced error handling within the inference method to switch between the default provider and the coding provider in case of failures. This ensures robustness by attempting to use a backup provider if the initially chosen provider fails.

These changes aim to improve flexibility and reliability in handling different types of tasks by leveraging multiple providers.