[Testing] Implement wait-for-condition mocking

Migration from https://github.com/aws/aws-durable-execution-sdk-python-testing/issues/46

---

## Context
Add condition registration and monitoring for wait-for-condition operations

## Technical Requirements
- Add condition registration and monitoring for wait-for-condition operations
- Implement condition mocking mechanism to trigger completion
- Add condition evaluation and timeout handling
- Implement proper error handling for condition failures

## Acceptance Criteria
- [ ] Condition registration and monitoring added for wait-for-condition operations
- [ ] Condition mocking mechanism implemented to trigger completion
- [ ] Condition evaluation and timeout handling added
- [ ] Proper error handling implemented for condition failures

首先检查已迁移的 issue 46，并定位 Python SDK 中现有的 wait-for-condition 入口点。根据列出的验收标准定义完成条件：注册和监控、模拟完成、带超时的条件评估，以及失败时的错误处理。

由索引模型根据 Issue 内容生成。