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)" }

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

@@ -0,0 +1,7 @@
+import kotlin.collections.firstOrNull as aaa
+
+fun foo() {
+    listOf(1, 2).aa<caret>
+}
+
+// EXIST: { lookupString: "aaa", itemText: "aaa", tailText: "() for List<T> (kotlin.collections.firstOrNull)" }

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

@@ -0,0 +1,9 @@
+import java.io.File
+import kotlin.io.extension as ext
+
+fun foo(file: File): String {
+    return file.ex<caret>
+}
+
+// COMPLETION_TYPE: SMART
+// EXIST: { lookupString: "ext", itemText: "ext", tailText: " for File (kotlin.io.extension)" }

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

@@ -0,0 +1,5 @@
+import java.util.ArrayList as JavaList
+
+fun foo(): Ja<caret>
+
+// EXIST: { lookupString: "JavaList", itemText: "JavaList" }

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

@@ -0,0 +1,7 @@
+import kotlin.collections.listOf as list
+
+fun foo() {
+    lis<caret>
+}
+
+// EXIST: { lookupString: "list", itemText: "list", tailText: "() (kotlin.collections.listOf)" }

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

@@ -0,0 +1,7 @@
+import kotlin.io.DEFAULT_BUFFER_SIZE as BUFSIZE
+
+fun foo() {
+    BUF<caret>
+}
+
+// EXIST: { lookupString: "BUFSIZE", itemText: "BUFSIZE", tailText: " (kotlin.io.DEFAULT_BUFFER_SIZE)" }

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

@@ -0,0 +1,5 @@
+import kotlin.collections.ArrayList as KotlinArrayList
+
+fun foo(): KotAr<caret>
+
+// EXIST: { lookupString: "KotlinArrayList", itemText: "KotlinArrayList", tailText: "<E> (kotlin.collections.ArrayList)", typeText: "ArrayList<E>" }