feat: added Amazon Bedrock Cohere R plus and Cohere R models

[curlyfro]

fix: fixed small issues

Summary by CodeRabbit

• New Features

  • Introduced new chat and embedding models for enhanced interaction and data processing capabilities.
  • Added new settings for chat and embedding functionalities to allow more customized user experiences.

• Enhancements

  • Improved the chat model's response generation with new asynchronous methods.
  • Enhanced embedding models with the ability to process input strings asynchronously.

• Bug Fixes

  • Corrected the token limit setting in chat configurations to optimize performance.

• Refactor

  • Updated class identifiers and constructors to align with new functionalities.
  • Modified tests to incorporate new models and settings effectively.

[coderabbitai[bot]]

Walkthrough

The updates across various files in the Amazon Bedrock module focus on enhancing chat and embedding functionalities, adjusting settings for maximal tokens, and refining model identifiers. New classes and methods are introduced to support asynchronous operations and JSON body creation, improving interaction with Cohere and Amazon Titan models.

Changes

File Path	Change Summary
.../Chat/CohereCommandRModel.cs, .../Predefined/Cohere.cs	Introduced CohereCommandRModel and derived classes for enhanced chat functionalities using Cohere models.
.../Chat/Settings/MetaLlama2ChatSettings.cs	Reduced MaxTokens from 4000 to 2048.
.../Embedding/..., .../Predefined/Amazon.cs	Added new embedding models and settings, including constructors and asynchronous methods.
.../Predefined/Mistral.cs	Corrected a typo in model identifier.
.../test/BedrockTests.cs, .../test/BedrockTextModelTests.cs	Updated tests, imports, and instantiation parameters. Adjusted exception handling and syntax.

🐰✨ In the land of code where the Bedrock lies, The models chat and the data flies. With tweaks and changes, small and grand, A rabbit hops through this digital land. Celebrate the code, so craftily spun, For in the world of zeros, we all are one. 🌟 🐰💻

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