feat: cohere inference api endpoint

[GangGreenTemperTatum]

adds a new API endpoint to support Cohere API v2 inference (https://docs.cohere.com/v2/docs/chat-api)
closes ENG-551

AI-Generated Summary

PR Summary

Overview of Changes

Ahoy! This PR be chartin' a course towards integratin' the Cohere /v2/chat API into the burpference sea of code. By the stars, it updates the .gitignore to only shun configs with a _local suffix, sparing any file without it. On the deck, a new CohereAPIAdapter class is now standin' ready, a sturdy vessel for handlin' requests and responses to and from Cohere's API. Further into the hold, the README.md in the configs directory now boasts instructions for settin' sail with the Cohere API, includin' an example configuration scribbled neatly in JSON. Lastly, a brand new configuration file be added to the mix, specifically tailored for interfacin' with Cohere's API.

Key Modifications

1. .gitignore Update: Changed to ignore only configs/*_local.json files, allowin' other config files to breathe the sea air without bein' unnoticed by the crew (Git).
2. Cohere API Adapter Addition: Crafted a new class CohereAPIAdapter within burpference/api_adapters.py, completin' the crew with methods for preparin', sendin', and processin' requests to Cohere's /v2/chat service.
3. Documentation for Cohere Integration: Updated the README.md within the configs directory to include a detailed map (documentation) for settin' course towards Cohere API integration, includin' a JSON example for the sake o' clarity.
4. Cohere Config File: Added a new configuration file cohere_command_r_plus_08_2024.json under the configs directory, markin' the coordinates for how the application should engage with the Cohere API.

Potential Impact

• This integration may well expand the horizons of burpference to include more diverse interactions with AI APIs, potentially increasin' the utility and flexibility of the tool.
• By altering the .gitignore, there's a chance for minor confusion or mishaps with config file tracking for landlubbers not familiar with the naming convention. Care should be taken to document and inform all crew members of this change.
• The new API adapter and configuration file specifically set the sails for deeper waters with Cohere's API, which might necessitate additional security considerations or performance implications under heavy usage or in rough seas (high-load scenarios).

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