Add inlay parameter name hints for function calls

Signed-off-by: imtsuki <me@qjx.app>

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -952,6 +952,7 @@ pub fn handle_inlay_hints(
             range: api_type.range.conv_with(&line_index),
             kind: match api_type.kind {
                 ra_ide::InlayKind::TypeHint => InlayKind::TypeHint,
+                ra_ide::InlayKind::ParameterHint => InlayKind::ParameterHint,
             },
         })
         .collect())

crates/ra_lsp_server/src/req.rs

@@ -197,6 +197,7 @@ pub struct InlayHintsParams {
 #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
 pub enum InlayKind {
     TypeHint,
+    ParameterHint,
 }
 
 #[derive(Debug, Deserialize, Serialize)]