Add a "scroll to position" function

I was looking at implementing some editor commands that scroll to next function/method/thing and none of the current API's scroll. Looks like there was a change at some point that made insert text, set selection, etc not scroll by default in VSCode.

We should implement a new request ShowEditorPositionRequest and add a function (Show-EditorPosition?) to Commands that sends it (and optionally also add it to $psEditor)

The VSCode implementation could use the TextEditor.revealRange method.

首先追踪 Commands 如何发送编辑器请求，以及 VSCode 实现如何处理编辑器操作。检查提议的 ShowEditorPositionRequest、Show-EditorPosition 命令和可选的 $psEditor API，然后对照 VSCode TextEditor.revealRange 文档进行比较。完成的标准是该请求和命令能够在 VSCode 中显示所请求的编辑器位置。