[Feature Request]: Alias作为实体收集[Collect aliases as independent entities]

[Cythia828]

Topic

Support new features on parser

Description

目前关于表别名、catalog别名等已经作为其实体相关属性收集，但其别名作为实体去收集也迫在眉睫，在实际使用场景中，我们也希望别名在使用处能够拿到其原实体的字段等其他属性。

Currently, aliases of tables, catalogs, etc., are collected as related attributes of their corresponding entities. However, treating aliases themselves as independent entities for collection has become an urgent need.

In practical usage scenarios, we also expect aliases to retain access to all original entity attributes (such as fields) at their point of use.

Related

DTStack/monaco-sql-languages#150

[JackWang032]

I think merging aliases into entities can already meet most practical needs.