Add a "scroll to position" function

[SeeminglyScience]

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.

[rkeithhill]

Sounds reasonable to me.

[TylerLeonhardt]

Sounds awesome