[Feature] Interface of Table Creation and Relational API

The interfaces of table currently support `list_table` and `drop_table`, while the creation of table API is required for users to launch a project.

Considering CnosDB support both internal and external table import, we'd better design different interfaces for them.

首先检查 Python 客户端中现有的 list_table 和 drop_table 接口。明确用于创建表的预期关系型 API，以及内部表导入和外部表导入应如何区分。接口设计和支持的创建行为达成一致并完成实现后，即视为完成。

由索引模型根据 Issue 内容生成。