Add a slash command for automatically retrieving relevant context (#17972)

* [x] put this slash command behind a feature flag until we release
embedding access to the general population
* [x] choose a name for this slash command and name the rust module to
match

Release Notes:

- N/A

---------

Co-authored-by: Jason <jason@zed.dev>
Co-authored-by: Richard <richard@zed.dev>
Co-authored-by: Jason Mancuso <7891333+jvmncs@users.noreply.github.com>
Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/assistant/src/slash_command_settings.rs

@@ -10,9 +10,9 @@ pub struct SlashCommandSettings {
     /// Settings for the `/docs` slash command.
     #[serde(default)]
     pub docs: DocsCommandSettings,
-    /// Settings for the `/project` slash command.
+    /// Settings for the `/cargo-workspace` slash command.
     #[serde(default)]
-    pub project: ProjectCommandSettings,
+    pub cargo_workspace: CargoWorkspaceCommandSettings,
 }
 
 /// Settings for the `/docs` slash command.
@@ -23,10 +23,10 @@ pub struct DocsCommandSettings {
     pub enabled: bool,
 }
 
-/// Settings for the `/project` slash command.
+/// Settings for the `/cargo-workspace` slash command.
 #[derive(Deserialize, Serialize, Debug, Default, Clone, JsonSchema)]
-pub struct ProjectCommandSettings {
-    /// Whether `/project` is enabled.
+pub struct CargoWorkspaceCommandSettings {
+    /// Whether `/cargo-workspace` is enabled.
     #[serde(default)]
     pub enabled: bool,
 }