extract class: do not warn about usages of statics in class initializers, preserve static imports (IDEA-106017)

java/java-tests/testData/refactoring/extractClass/staticImports/after/foo/Extracted.java

@@ -0,0 +1,7 @@
+package foo;
+
+public class Extracted {
+    public static <T> T foo() {
+        return null;
+    }
+}

java/java-tests/testData/refactoring/extractClass/staticImports/after/foo/Test.java

@@ -0,0 +1,3 @@
+package foo;
+class Test {
+}

java/java-tests/testData/refactoring/extractClass/staticImports/after/foo/Usage.java

@@ -0,0 +1,8 @@
+package foo;
+import static foo.Extracted.foo;
+
+class Usage {
+  {
+    foo();
+  }
+}

java/java-tests/testData/refactoring/extractClass/staticImports/before/foo/Test.java

@@ -0,0 +1,4 @@
+package foo;
+class Test {
+  public static <T> T foo() { return null; }
+}

java/java-tests/testData/refactoring/extractClass/staticImports/before/foo/Usage.java

@@ -0,0 +1,8 @@
+package foo;
+import static foo.Test.foo;
+
+class Usage {
+  {
+    foo();
+  }
+}