Support for import aliases in code completion

#KT-8848 Fixed

idea/idea-completion/testData/basic/java/importAliases/Class.kt

@@ -0,0 +1,7 @@
+import java.io.FileInputStream as FileInputStreamMy
+
+fun foo(): FileInputS<caret>
+
+// WITH_ORDER
+// EXIST: { lookupString: "FileInputStreamMy", itemText: "FileInputStreamMy", tailText: " (java.io.FileInputStream)" }
+// EXIST: { lookupString: "FileInputStream", itemText: "FileInputStream", tailText: " (java.io)" }