[Feature Request] Configurable screen dimensions

[the-rpc]

Add a feature that allows users to set the screen dimensions for the test and set the default to 1920x1080 to match the most common desktop screen dimensions.

[janwiemers]

@the-rpc the bedrock_agents.core sdk currently does not allow to specify the viewport, regarding to this: https://github.com/aws/bedrock-agentcore-sdk-python/blob/release/v0.1.4/src/bedrock_agentcore/tools/browser_client.py. Do you have any other source of information?

[the-rpc]

@the-rpc the bedrock_agents.core sdk currently does not allow to specify the viewport, regarding to this: https://github.com/aws/bedrock-agentcore-sdk-python/blob/release/v0.1.4/src/bedrock_agentcore/tools/browser_client.py. Do you have any other source of information?

@janwiemers is this something we can control now with the updates in PR #12 ?