Group message by role when using claude bedrock client

[kevinmessiaen]

Description

Group message by role when using Claude bedrock client, this allow some edge case to work such as:

resp = claude_client.complete(messages=[
    ChatMessage(role='system', content='This is a test'),
    ChatMessage(role='user', content='This is the first message'),
    ChatMessage(role='user', content='This is the second message'),
    ChatMessage(role='user', content='Is it working?'),
])

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

[sonarcloud]

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