Tools calling in bedrock

[swosty]

Describe the bug
In the schema
AssistantMessage(BaseModel):
role: Literal["assistant"] = "assistant"
content: str |list | None
tool_calls: list[ToolCall] | None = None.

The content should be a str or a list (for bedrock models) cause when we send the message and get the tool use request from response the assistant message has a list in the content s which can be passed as is.
Same can be done for UserMessage

Please complete the following information:

• Which API you used: [e.g. /chat/completions] /chat/completions
• Which model you used: [e.g. anthropic.claude-3-sonnet-20240229-v1:0] anthropic.claude-3-sonnet-20240229-v1:0

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