feat(driver): add escape to the pressKey surface

escape is a key a spec has real use for and no platform could send it. android maps it to KEYCODE_ESCAPE, the ios companion to HID usage 41 and the in-simulator runner to XCUIKeyboardKey.escape, and the Key union accepts it so it can be written at all.

pkg/spec/src/types.ts

@@ -184,6 +184,7 @@ export type Key =
   | "home"
   | "enter"
   | "tab"
+  | "escape"
   | "up"
   | "down"
   | "left"