Mark most assists as the base "refactor" type

Most of them area. We will separate them out later but this gets them to
show up in the "refactor" menu of vscode.

Author: kjeremy

crates/rust-analyzer/src/main_loop/handlers.rs

@@ -19,8 +19,7 @@ use lsp_types::{
     TextEdit, Url, WorkspaceEdit,
 };
 use ra_ide::{
-    Assist, AssistId, FileId, FilePosition, FileRange, Query, RangeInfo, Runnable, RunnableKind,
-    SearchScope,
+    Assist, FileId, FilePosition, FileRange, Query, RangeInfo, Runnable, RunnableKind, SearchScope,
 };
 use ra_prof::profile;
 use ra_syntax::{AstNode, SyntaxKind, TextRange, TextSize};
@@ -705,15 +704,9 @@ fn create_single_code_action(assist: Assist, world: &WorldSnapshot) -> Result<Co
         arguments: Some(vec![arg]),
     };
 
-    let kind = match assist.id {
-        AssistId("introduce_variable") => Some("refactor.extract.variable".to_string()),
-        AssistId("add_custom_impl") => Some("refactor.rewrite.add_custom_impl".to_string()),
-        _ => None,
-    };
-
     Ok(CodeAction {
         title,
-        kind,
+        kind: Some("refactor".to_owned()),
         diagnostics: None,
         edit: None,
         command: Some(command),