delete imports on safe delete of class (IDEA-139288)

java/java-tests/testData/refactoring/safeDelete/safeDeleteImports/after/B.java

@@ -0,0 +1,3 @@
+class B {
+
+}

java/java-tests/testData/refactoring/safeDelete/safeDeleteImports/before/A.java

@@ -0,0 +1,3 @@
+public class A {
+}
+

java/java-tests/testData/refactoring/safeDelete/safeDeleteImports/before/B.java

@@ -0,0 +1,4 @@
+import <caret>A;
+class B {
+
+}