[FHL] Make VTApiRoutines, which does VT translation for output (#11264)

Make a VTApiRoutines servicer that does minimal translations instead of
environmental simulation for some output methods. Remaining methods are
backed on the existing console host infrastructure (primarily input
related methods).

## PR Checklist
* [x] I work here
* [x] It's Fix-Hack-Learn quality so it's behind a feature gate so we
  can keep refining it. But it's a start!

To turn this on, you will have to be in the Dev or Preview rings
(feature staged).  Then add `experimental.connection.passthroughMode:
true` to a profile and on the next launch, the flags will propagate down
through the `ConptyConnection` into the underlying `Openconsole.exe`
startup and tell it to use the passthrough mode instead of the full
simulation mode.

## Validation Steps Performed
- Played with it manually in CMD.exe, it seems to work mostly.
- Played with it manually in Ubuntu WSL, it seems to work.
- Played with it manually in Powershell and it's mostly sad. It'll get
  there.

Starts #1173

.vscode/settings.json

@@ -94,7 +94,11 @@
         "xlocinfo": "cpp",
         "xmemory": "cpp",
         "xstddef": "cpp",
-        "xtr1common": "cpp"
+        "xtr1common": "cpp",
+        "coroutine": "cpp",
+        "format": "cpp",
+        "forward_list": "cpp",
+        "latch": "cpp"
     },
     "files.exclude": {
         "**/bin/**": true,