Improve keymap json schema (#23044)

Also:

* Adds `impl_internal_actions!` for deriving the `Action` trait without
registering.

* Removes some deserializers that immediately fail in favor of
`#[serde(skip)]` on fields where they were used. This also omits them
from the schema.

Release Notes:

- Keymap settings file now has more JSON schema information to inform
`json-language-server` completions and info, particularly for actions
that take input.

crates/title_bar/Cargo.toml

@@ -36,6 +36,7 @@ notifications.workspace = true
 project.workspace = true
 remote.workspace = true
 rpc.workspace = true
+schemars.workspace = true
 serde.workspace = true
 settings.workspace = true
 smallvec.workspace = true

crates/title_bar/src/application_menu.rs

@@ -1,17 +1,18 @@
 use gpui::{impl_actions, OwnedMenu, OwnedMenuItem, View};
+use schemars::JsonSchema;
 use serde::Deserialize;
 use smallvec::SmallVec;
 use ui::{prelude::*, ContextMenu, PopoverMenu, PopoverMenuHandle, Tooltip};
 
 impl_actions!(
     app_menu,
-    [OpenApplicationMenu, NavigateApplicationMenuInDirection,]
+    [OpenApplicationMenu, NavigateApplicationMenuInDirection]
 );
 
-#[derive(Clone, Deserialize, PartialEq, Default)]
+#[derive(Clone, Deserialize, JsonSchema, PartialEq, Default)]
 pub struct OpenApplicationMenu(String);
 
-#[derive(Clone, Deserialize, PartialEq, Default)]
+#[derive(Clone, Deserialize, JsonSchema, PartialEq, Default)]
 pub struct NavigateApplicationMenuInDirection(String);
 
 #[derive(Clone)]