Configure memory usage

I saw a pull-request opened a while back that introduced the possibility of analyzing bigger than memory datasets by saving some of the state on disk, I was wondering if there is a way for the user to configure the maximum amount of memory the process can use?

Like `duckdb` has `"SET max_memory='1GB';"`

首先定位之前为大于内存的数据集添加磁盘后端状态的 pull request，然后追踪用户如何在 Python 绑定中配置执行设置。定义用户可配置的内存限制应如何运行，包括它与磁盘后端处理的交互，并添加覆盖范围以证明已配置的限制得到遵守。

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