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>

script/upload-nightly

@@ -33,6 +33,12 @@ bucket_name="zed-nightly-host"
 
 sha=$(git rev-parse HEAD)
 echo ${sha} > target/latest-sha
+
+find target -type f -name "zed-remote-server-*.gz" -print0 | while IFS= read -r -d '' file_to_upload; do
+    upload_to_blob_store $bucket_name "$file_to_upload" "nightly/$(basename "$file_to_upload")"
+    rm -f "$file_to_upload"
+done
+
 case "$target" in
     macos)
         upload_to_blob_store $bucket_name "target/aarch64-apple-darwin/release/Zed.dmg" "nightly/Zed-aarch64.dmg"
@@ -43,9 +49,9 @@ case "$target" in
         rm -f "target/latest-sha"
         ;;
     linux-targz)
-        find . -type f -name "zed-*.tar.gz" -print0 | while IFS= read -r -d '' bundle_file; do
-            upload_to_blob_store $bucket_name "$bundle_file" "nightly/$(basename "$bundle_file")"
-            rm -f "$bundle_file"
+        find . -type f -name "zed-*.tar.gz" -print0 | while IFS= read -r -d '' file_to_upload; do
+            upload_to_blob_store $bucket_name "$file_to_upload" "nightly/$(basename "$file_to_upload")"
+            rm -f "$file_to_upload"
         done
         upload_to_blob_store $bucket_name "target/latest-sha" "nightly/latest-sha-linux-targz"
         rm -f "target/latest-sha"