Added Accelerators and Examples for Integrating Snowflake Cortex Services as Custom LLM Providers

[seaniannuzzi-blend360]

Summary of Changes:

This PR introduces several helper classes for seamless integration with Snowflake Cortex services within the Crew AI examples library, along with examples demonstrating how to use these classes with both custom-deployed Snowflake Cortex services and the Snowflake Inference Completion Service.

• Snowflake Cortex Custom Service Class: This class enables integration with custom-created Cortex services associated with Snowflake databases, allowing Crew AI agents to interact with Snowflake’s data as part of agent tasks.

• Snowflake Cortex Inference Service Class: This class facilitates the use of Snowflake's built-in foundation models (e.g., Mistral, Llama3, etc.) through the Cortex Inference Service API, streamlining the interaction with pre-deployed models and enhancing AI-driven workflows within Crew AI using Snowflake’s already deployed LLMs.

The example classes demonstrate how to use Snowflake Cortex as a custom LLM provider and how to add it to the custom provider map for LiteLLM. Once added, this makes it easy to integrate both custom and standard Snowflake Cortex services as LLMs into agents, tasks, and crews.