feat: new ya.confirm() API

[sxyazi]

An implementation of the feature request: #2082

Closes #2082

---

local answer = ya.confirm {
  pos = { "center", w = 40, h = 10 },
  title = "Test",
  content = "Hello, World!",
}

You can also apply a UI element to the title and content, to customize the appearance:

local answer = ya.confirm {
  pos = { "center", w = 40, h = 10 },
  title = ui.Line("Test"):fg("yellow"):bold(),
  content = ui.Text("Hello, World!"):bg("red"):fg("#ffffff"),
}

The available values for pos are the same as those for ya.input(), https://yazi-rs.github.io/docs/plugins/utils#ya.input

[hankertrix]

Would you be open to renaming pos to position? It's to match the ya.input arguments.

[sxyazi]

ya.input's position will be deprecated and renamed to pos in the future, to match its type name ui.Pos

[hankertrix]

Ah I see, thanks!