KT-15153 Support typeAlias extensions in completion and add import

#KT-15153 fixed

idea/idea-completion/testData/basic/common/ExtensionOnTypeAliasFromOtherTypeAlias.kt

@@ -0,0 +1,13 @@
+class A
+
+typealias TA = A
+typealias TA1 = A
+
+fun TA.ext() {}
+
+fun usage() {
+    val ta = TA1()
+    ta.<caret>
+}
+
+// EXIST: ext

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java

@@ -158,6 +158,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
+        @TestMetadata("ExtensionOnTypeAliasFromOtherTypeAlias.kt")
+        public void testExtensionOnTypeAliasFromOtherTypeAlias() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/ExtensionOnTypeAliasFromOtherTypeAlias.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("ExtensionToIntInFloatStyle.kt")
         public void testExtensionToIntInFloatStyle() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/ExtensionToIntInFloatStyle.kt");

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java

@@ -158,6 +158,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("ExtensionOnTypeAliasFromOtherTypeAlias.kt")
+        public void testExtensionOnTypeAliasFromOtherTypeAlias() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/ExtensionOnTypeAliasFromOtherTypeAlias.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("ExtensionToIntInFloatStyle.kt")
         public void testExtensionToIntInFloatStyle() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/ExtensionToIntInFloatStyle.kt");