Add the ability to edit remote directories over SSH (#14530)

This is a first step towards allowing you to edit remote projects
directly over SSH. We'll start with a pretty bare-bones feature set, and
incrementally add further features.

### Todo

Distribution
* [x] Build nightly releases of `zed-remote-server` binaries
    * [x] linux (arm + x86)
    * [x] mac (arm + x86)
* [x] Build stable + preview releases of `zed-remote-server`
* [x] download and cache remote server binaries as needed when opening
ssh project
* [x] ensure server has the latest version of the binary


Auth
* [x] allow specifying password at the command line
* [x] auth via ssh keys
* [x] UI password prompt

Features
* [x] upload remote server binary to server automatically
* [x] opening directories
* [x] tracking file system updates
* [x] opening, editing, saving buffers
* [ ] file operations (rename, delete, create)
* [ ] git diffs
* [ ] project search

Release Notes:

- N/A

---------

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

crates/editor/src/editor.rs

@@ -488,6 +488,7 @@ pub struct Editor {
     mode: EditorMode,
     show_breadcrumbs: bool,
     show_gutter: bool,
+    redact_all: bool,
     show_line_numbers: Option<bool>,
     show_git_diff_gutter: Option<bool>,
     show_code_actions: Option<bool>,
@@ -1822,6 +1823,7 @@ impl Editor {
             show_code_actions: None,
             show_runnables: None,
             show_wrap_guides: None,
+            redact_all: false,
             show_indent_guides,
             placeholder_text: None,
             highlight_order: 0,
@@ -10414,6 +10416,11 @@ impl Editor {
         cx.notify();
     }
 
+    pub fn set_redact_all(&mut self, redact_all: bool, cx: &mut ViewContext<Self>) {
+        self.redact_all = redact_all;
+        cx.notify();
+    }
+
     pub fn set_show_wrap_guides(&mut self, show_wrap_guides: bool, cx: &mut ViewContext<Self>) {
         self.show_wrap_guides = Some(show_wrap_guides);
         cx.notify();
@@ -11108,6 +11115,10 @@ impl Editor {
         display_snapshot: &DisplaySnapshot,
         cx: &WindowContext,
     ) -> Vec<Range<DisplayPoint>> {
+        if self.redact_all {
+            return vec![DisplayPoint::zero()..display_snapshot.max_point()];
+        }
+
         display_snapshot
             .buffer_snapshot
             .redacted_ranges(search_range, |file| {