Show configuration in language server debug logs (#23084)

Release Notes:

- Added configuration sent on initialization to the `Server Info`
section of the language server logs.

crates/settings/src/keymap_file.rs

@@ -265,6 +265,8 @@ impl KeymapFile {
             .definitions
             .insert("KeymapAction".to_owned(), action_schema);
 
+        // This and other json schemas can be viewed via `debug: open language server logs` ->
+        // `json-language-server` -> `Server Info`.
         serde_json::to_value(root_schema).unwrap()
     }