Add 'removeUnusedLambdaParameters' to the cleanup settings.

Signed-off-by: Roland Grunberg <[email protected]>

Author: rgrunber

document/_java.learnMoreAboutCleanUps.md

@@ -405,4 +405,56 @@ public class A {
         Parser a12;
     }
 }
+```
+
+### `removeUnusedLambdaParameters`
+
+Rename unused lambda parameters, or unused pattern variables to `_`.
+
+For example:
+
+```java
+public class Unused {
+
+    private interface J {
+        public void run(String a, String b);
+    }
+
+    public static void main(String[] args) {
+        record R(int i, long l) {}
+
+        J j = (a, b) -> System.out.println(a);
+        j.run("a", "b");
+
+        R r = new R(1, 1);
+        switch (r) {
+            case R(_, long l) -> {}
+            case R r2 -> {}
+		}
+    }
+}
+```
+
+becomes:
+
+```java
+public class Unused {
+
+	private interface J {
+        public void run(String a, String b);
+    }
+
+    public static void main(String[] args) {
+        record R(int i, long l) {}
+
+        J j = (a, _) -> System.out.println(a);
+        j.run("a", "b");
+
+        R r = new R(1, 1);
+        switch (r) {
+            case R(_, _) -> {}
+            case R _ -> {}
+        }
+    }
+}
 ```

package.json

@@ -1313,7 +1313,8 @@
                 "switchExpression",
                 "tryWithResource",
                 "renameFileToType",
-                "organizeImports"
+                "organizeImports",
+                "removeUnusedLambdaParameters"
               ]
             },
             "default": [