Merge #10802

10802: Allow clients to configure the global workspace search limit r=Veykril a=knutwalker

Playing around with [helix](https://helix-editor.com) I realized that the global worksapce symbol search works different compared to vs-code.
Helix requires all possible symbols in one query and does no subsequent refinement searched.
This PR adds a configuration option to override the default search limit with the default being the currently hardocded value.
Helix users can increment this limit for their instance with a config like

```toml
[[language]]
name = "rust"
language-server = { command = "rust-analyzer" }
[language.config]
workspace = { symbol = { search = { limit = 65536 }}}
```

Other editors are not affected by this change.


Co-authored-by: Paul Horn <dev@knutwalker.engineer>

crates/rust-analyzer/src/config.rs

@@ -354,6 +354,10 @@ config_data! {
         workspace_symbol_search_scope: WorkspaceSymbolSearchScopeDef = "\"workspace\"",
         /// Workspace symbol search kind.
         workspace_symbol_search_kind: WorkspaceSymbolSearchKindDef = "\"only_types\"",
+        /// Limits the number of items returned from a workspace symbol search (Defaults to 128).
+        /// Some clients like vs-code issue new searches on result filtering and don't require all results to be returned in the initial search.
+        /// Other clients requires all results upfront and might require a higher limit.
+        workspace_symbol_search_limit: usize = "128",
     }
 }
 
@@ -487,8 +491,10 @@ pub struct RunnablesConfig {
 pub struct WorkspaceSymbolConfig {
     /// In what scope should the symbol be searched in.
     pub search_scope: WorkspaceSymbolSearchScope,
-    /// What kind of symbol is being search for.
+    /// What kind of symbol is being searched for.
     pub search_kind: WorkspaceSymbolSearchKind,
+    /// How many items are returned at most.
+    pub search_limit: usize,
 }
 
 pub struct ClientCommandsConfig {
@@ -995,6 +1001,7 @@ impl Config {
                 WorkspaceSymbolSearchKindDef::OnlyTypes => WorkspaceSymbolSearchKind::OnlyTypes,
                 WorkspaceSymbolSearchKindDef::AllSymbols => WorkspaceSymbolSearchKind::AllSymbols,
             },
+            search_limit: self.data.workspace_symbol_search_limit,
         }
     }
 
@@ -1298,6 +1305,7 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
 
     match ty {
         "bool" => set!("type": "boolean"),
+        "usize" => set!("type": "integer", "minimum": 0),
         "String" => set!("type": "string"),
         "Vec<String>" => set! {
             "type": "array",