Support quotes at the end of a raw string

Fix for KT-4650 Can't use double quote at the end of the raw string

#KT-4650 Fixed

compiler/testData/psi/stringTemplates/RawStringsWithManyQuotes.kt

@@ -0,0 +1,19 @@
+fun foo() {
+    """"""
+    """""""
+    """"""""
+    """""""""
+    """"""""""
+
+    """" """
+    """"" """
+
+    """ """"
+    """ """""
+    """ """"""
+    """ """""""
+    """ """"""""
+
+    """" """"
+    """"" """""
+}