[Testing] Localrunner `run_until_suspension`

Migration from https://github.com/aws/aws-durable-execution-sdk-python-testing/issues/219

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It would be helpful if an alternative method `run_until_suspension` can be provided, which returns when the execution is suspended and users can choose to inspect the history events, interact with callbacks, skip the timers and etc.

_Originally posted by @zhongkechen in https://github.com/aws/aws-durable-execution-sdk-python-testing/pull/192#discussion_r3157449190_

首先定位 Localrunner 的实现及其现有的执行方法，然后对比迁移后的 issue 和相关讨论，以确定预期的暂停行为。当 run_until_suspension 入口点在执行暂停时返回，并允许调用方检查历史记录、与回调交互以及跳过计时器时，即表示完成。

由索引模型根据 Issue 内容生成。