### `OSC 9001; CmdNotFound; <missingCmd>`
Adds support for custom OSC "command not found" sequence `OSC 9001;
CmdNotFound; <missingCmd>`. Upon receiving the "CmdNotFound" variant
with the missing command payload, we send the missing command up to the
Quick Fix menu and add it in as `winget install <missingCmd>`.

### Quick Fix UI
The Quick Fix UI is a new UI surface that lives in the gutter (left
padding) of your terminal. The button appears if quick fixes are
available. When clicked, a list of suggestions appears in a flyout. If
there is not enough space in the gutter, the button will be presented in
a collapsed version that expands to a normal size upon hovering over it.

The Quick Fix UI was implemented similar to the context menu. The UI
itself lives in TermControl, but it can be populated by other layers
(i.e. TermApp layer).

Quick Fix suggestions are also automatically loaded into the Suggestions
UI.

If a quick fix is available and a screen reader is attached, we dispatch
an announcement that quick fixes are available to notify the user that
that's the case.

Spec: #17005
#16599

### Follow-ups
- #17377: Add a key binding for quick fix
- #17378: Use winget to search for packages using `missingCmd`

---------

Co-authored-by: Dustin L. Howett <[email protected]>
Co-authored-by: Dustin L. Howett <[email protected]>