Extract VimModeSetting to its own crate (#21019)

This PR extracts the `VimModeSetting` out of the `vim` crate and into
its own `vim_mode_setting` crate.

A number of crates were depending on the entirety of the `vim` crate
just to reference `VimModeSetting`, which was not ideal.

Release Notes:

- N/A

crates/vim/src/vim.rs

@@ -41,15 +41,11 @@ use state::{Mode, Operator, RecordedSelection, SearchState, VimGlobals};
 use std::{mem, ops::Range, sync::Arc};
 use surrounds::SurroundsType;
 use ui::{IntoElement, VisualContext};
+use vim_mode_setting::VimModeSetting;
 use workspace::{self, Pane, Workspace};
 
 use crate::state::ReplayableAction;
 
-/// Whether or not to enable Vim mode.
-///
-/// Default: false
-pub struct VimModeSetting(pub bool);
-
 /// An Action to Switch between modes
 #[derive(Clone, Deserialize, PartialEq)]
 pub struct SwitchMode(pub Mode);
@@ -89,7 +85,7 @@ impl_actions!(vim, [SwitchMode, PushOperator, Number, SelectRegister]);
 
 /// Initializes the `vim` crate.
 pub fn init(cx: &mut AppContext) {
-    VimModeSetting::register(cx);
+    vim_mode_setting::init(cx);
     VimSettings::register(cx);
     VimGlobals::register(cx);
 
@@ -1122,23 +1118,6 @@ impl Vim {
     }
 }
 
-impl Settings for VimModeSetting {
-    const KEY: Option<&'static str> = Some("vim_mode");
-
-    type FileContent = Option<bool>;
-
-    fn load(sources: SettingsSources<Self::FileContent>, _: &mut AppContext) -> Result<Self> {
-        Ok(Self(
-            sources
-                .user
-                .or(sources.server)
-                .copied()
-                .flatten()
-                .unwrap_or(sources.default.ok_or_else(Self::missing_default)?),
-        ))
-    }
-}
-
 /// Controls when to use system clipboard.
 #[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
 #[serde(rename_all = "snake_case")]