✨ [Feature]: base-select remote support load more

[ichynul]

What problem does this feature solve

需求：加载远程数据时，支持加载更多。

目前只能加载一次，不太灵活。
比如一个数据可能总的有30条数据，接口默认返回20条。后面10条本来再加载一下就全部出来了。不支持加载更多的话，只能输入关键字缩小结果集。
那如果我想全部加载出来，只能把默认返回数量放大一些，比如一次返回100条，也能解决上面问题。
但这样有些繁琐，需要为不同的数据接口设置不同的返回数量。

What does the proposed API look like

两种方法，
1、调整远程搜索方法增加一个参数：remote-method: (query:string, more:bool)
2、或者暴露下拉选项到底事件，用户自己实现

What is your project name

none

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What problem does this feature solve

Requirement: When loading remote data, support loading more.

Currently it can only be loaded once and is not very flexible.
For example, a piece of data may have a total of 30 pieces of data, and the interface returns 20 pieces by default. The next 10 items were all displayed after loading again. If loading more is not supported, you can only enter keywords to narrow the result set.
Then if I want to load them all, I can only enlarge the default return number, such as returning 100 items at a time, which can also solve the above problem.
But this is a bit cumbersome, and different return quantities need to be set for different data interfaces.

What does the proposed API look like

Two methods,

1. Adjust the remote search method and add a parameter: remote-method: (query: string, more: bool)
2. Or expose the drop-down option to the end event, and the user can implement it by himself

What is your project name

none

[kagol]

@ichynul 可以加一个滚动事件（popup-scroll），把当前滚动的数据抛出去，这样用户可以自己进行扩展，获得更多的控制权，也更通用一些

[Issues-translate-bot]

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@ichynul You can add a scroll event to throw out the currently scrolled data, so that users can expand by themselves, gain more control, and be more versatile.