Add city parameter to weather tool

[ktzouvanaws]

Amazon Bedrock AgentCore Samples Pull Request

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Issue number: 1302

Concise description of the PR

City parameter is added to the weather tool, and prompts are adjusted so that it is excibited, how the Agent is able to extract name of the city in the prompt and execute the method, correctly passing the parameter. Method documentation is updated, 
so that Agent can understand the tool and use it properly.

User experience

Please share what the user experience looks like before and after this change
Prior to the change, users executing the notebook, would see the Agent calling a tool that
accepts no parameters and returns a hardcoded string. This oftenly resulted in user frustraction
as it is presented how the Agent extracts and passes parametes to tools.

Now they will see the Agent identifying the parameter and correctly passing it to the tool.

As this notebook is used in deep dive official agent core workshop, often customers
would harsly critisize the implementation due to the lack of parameters.

Checklist

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• I have reviewed the contributing guidelines
• Add your name to CONTRIBUTORS.md
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Are you uploading a dataset?
• [] Have you documented Introduction, Architecture Diagram, Prerequisites, Usage, Sample Prompts, and Clean Up steps in your example README?
• I agree to resolve any issues created for this example in the future.
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Acknowledgment

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