Merge #7297 #7338

7297: Propose trait associated items and autoimport traits on completion r=matklad a=SomeoneToIgnore

![trait_imports](https://user-images.githubusercontent.com/2690773/104819998-6faeb480-583a-11eb-8b45-b7351b51b90e.gif)

Closes #7248

7338: Parse `impl const Trait` r=Veykril a=Veykril

Closes #7313

bors r+

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Lukas Wirth <lukastw97@gmail.com>

crates/ide/src/lib.rs

@@ -478,6 +478,7 @@ impl Analysis {
         position: FilePosition,
         full_import_path: &str,
         imported_name: String,
+        import_for_trait_assoc_item: bool,
     ) -> Cancelable<Vec<TextEdit>> {
         Ok(self
             .with_db(|db| {
@@ -487,6 +488,7 @@ impl Analysis {
                     position,
                     full_import_path,
                     imported_name,
+                    import_for_trait_assoc_item,
                 )
             })?
             .unwrap_or_default())