Add standard integration tests for Amazon, AI21, Cohere and Meta models

[3coins]

Add standard integration test suite for Amazon, AI21, Cohere, and Meta models for the ChatBedrock and ChatBedrockConverse classes. For example, here is the standard test for Anthropic models.

class TestBedrockStandard(ChatModelIntegrationTests):
    @property
    def chat_model_class(self) -> Type[BaseChatModel]:
        return ChatBedrockConverse

    @property
    def chat_model_params(self) -> dict:
        return {"model": "anthropic.claude-3-sonnet-20240229-v1:0"}

    @property
    def standard_chat_model_params(self) -> dict:
        return {"temperature": 0, "max_tokens": 100, "stop": []}

    @property
    def supports_image_inputs(self) -> bool:
        return True

Note: The converse API does not support all capabilities for all providers defined within the standard test integration suite, some of which has to be skipped. For more details on compatibility of converse API, see the Bedrock documentation here.
https://docs.aws.amazon.com/bedrock/latest/userguide/conversation-inference-supported-models-features.html

[3coins]

As of 12/9/2024, integration tests for Cohere and Meta has been added.