Add centerOnLaunch setting

[zadjii-msft]

This PR is a resurrection of #8414. @Hegunumo has apparently deleted
their account, but the contribution was still valuable. I'm just here to
get it across the finish line.

This PR adds new global setting centerOnLaunch. When set to true,
the Terminal window will be centered on the display it opens on.

So the interactions are like:

• initialPos: x,y, centered: true, launchMode: default
  center on the monitor that x,y is on

• initialPos: x,y, centered: true, launchMode: maximized
  maximized on the monitor that x,y is on (centered adds nothing)

• initialPos: <omitted>, centered: true, launchMode: default
  center on the default monitor

• initialPos: <omitted>, centered: true, launchMode: focus
  center, focus mode on the default monitor

• initialPos: <omitted>, centered: true, launchMode: maximized
  maximized on the default monitor (centered adds nothing)

Validation Steps Performed

I've played with it on multiple different monitors, and it seems to work
on all of them.

Closes #8414 (original PR)
Closes #7722

Co-authored-by: Kiminori Kaburagi yukawa_hidenori@icloud.com

[carlos-zamora]

Great!

A few missing things:

• update the schema
• update the docs
• Settings UI
  • Option 1: Open a follow-up task to add this to SUI (add it to the correct milestone)
  • Option 2: Update it here and now

Remember, AddASetting.md exists to help out a bit. (Note, #8919 is coming in though, so that might make some of this a bit easier.) InitialPosition is not in SUI though, so that'll be a bit annoying. But I guess we could still do some kind of smart behavior for "if launchMode is not maximized, make centerOnLaunch appear"

[zadjii-msft]

@carlos-zamora RE: settings UI

I'm thinking this would make sense to just do all at once with initialPosition. There's not even a task tracking that yet, so I'll make one to deal with both. The interactions with the initialPosition, centerOnLaunch and launchMode are all interesting enough that I feel like this deserves it's own task.

---

EDIT: see "SUI: Add settings for initalPosition, centerOnLaunch #9075"

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[ghost]

🎉Windows Terminal Preview v1.7.572.0 has been released which incorporates this pull request.:tada:

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