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/search/Cargo.toml

@@ -31,6 +31,7 @@ gpui.workspace = true
 language.workspace = true
 menu.workspace = true
 project.workspace = true
+schemars.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true

crates/search/src/buffer_search.rs

@@ -22,6 +22,7 @@ use project::{
     search::SearchQuery,
     search_history::{SearchHistory, SearchHistoryCursor},
 };
+use schemars::JsonSchema;
 use serde::Deserialize;
 use settings::Settings;
 use std::sync::Arc;
@@ -43,7 +44,7 @@ use registrar::{ForDeployed, ForDismissed, SearchActionsRegistrar, WithResults};
 
 const MAX_BUFFER_SEARCH_HISTORY_SIZE: usize = 50;
 
-#[derive(PartialEq, Clone, Deserialize)]
+#[derive(PartialEq, Clone, Deserialize, JsonSchema)]
 pub struct Deploy {
     #[serde(default = "util::serde::default_true")]
     pub focus: bool,