API to execute typed handler postprocessing in a separate command

This allows to undo the formatting separately from the typing which
has triggered the formatting (IDEA-126243)

java/java-tests/testData/codeInsight/typing/indentRBrace_after.java

@@ -0,0 +1,7 @@
+class Foo {
+  void m() {
+    if (true) {
+        System.out.println();
+    }<caret>
+  }
+}

java/java-tests/testData/codeInsight/typing/indentRBrace_afterUndo.java

@@ -0,0 +1,7 @@
+class Foo {
+  void m() {
+    if (true) {
+    System.out.println();
+    }<caret>
+  }
+}

java/java-tests/testData/codeInsight/typing/indentRBrace_before.java

@@ -0,0 +1,7 @@
+class Foo {
+  void m() {
+    if (true) {
+    System.out.println();
+    <caret>
+  }
+}