convert raw literal to string intention (IDEA-189855)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advRawStringLiteral/RawToStringTransformation.after.java

@@ -0,0 +1,8 @@
+class A {
+  {
+    String s = "a\n" +
+            "    symbol to escape: \"\\\" (slash)\n" +
+            "    and something else as well\n" +
+            "    ";
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advRawStringLiteral/RawToStringTransformation.java

@@ -0,0 +1,8 @@
+class A {
+  {
+    String s = `a
+    symbol to escape: "\" (slash)
+    and somet<caret>hing else as well
+    `;
+  }
+}