feat: AmazonBedrockChatGenerator - add tools support

[vblagoje]

Why:

Adds Haystack tool support to AmazonBedrockChatGenerator

• fixes Bedrock ChatGenerator - support for Tool haystack#8732

What:

• Added method to convert Haystack tools to Amazon Bedrock toolConfig format, facilitating tool integration.
• Modified AmazonBedrockChatGenerator to accept, serialize, and handle tool specifications as part of the chat messages.
• Updated testing suite to cover tool-related functionalities, ensuring robustness and reliability.

How can it be used:

The changes enable users to pass tools to AmazonBedrockChatGenerator, enhancing the model's capabilities by allowing it to use external tools within chat interactions. Here is a simplified example:

from haystack.dataclasses import ChatMessage
from haystack_integrations.components.generators.amazon_bedrock import AmazonBedrockChatGenerator
from haystack.tools import Tool

def weather(city: str):
        """Get weather for a given city."""
        return f"The weather in {city} is sunny and 32°C"

tool_parameters = {"type": "object", "properties": {"city": {"type": "string"}}, "required": ["city"]}
tool = Tool(
    name="weather",
    description="useful to determine the weather in a given location",
    parameters=tool_parameters,
    function=weather,
)

messages = [ChatMessage.from_user("What's the weather like in Paris?")]
generator = AmazonBedrockChatGenerator(model="model_name", tools=[tool])
response = generator.run(messages=messages)

How did you test it:

Implemented thorough unit and integration tests to validate the addition of tool-related functionalities. Tests included:

• Serialization and deserialization of tool configurations.
• Ensuring tool calls within conversations behave as expected.
• Integration tests with mock and live scenarios for tool usage within chat interactions.

Notes for the reviewer:

Please pay special attention to the serialization and deserialization processes for tool objects and the handling of tool calls within the chat messages. Consider reviewing the edge cases in the test suite that handle different orderings of tool messages in replies.