Support for import aliases in code completion

#KT-8848 Fixed

idea/idea-completion/testData/handlers/basic/importAliases/CompanionObject.kt

@@ -0,0 +1,7 @@
+import java.sql.Date as SqlDate
+
+fun foo() {
+    val v: SqlDate = SqlDa<caret>
+}
+
+// ELEMENT: "SqlDate"

idea/idea-completion/testData/handlers/basic/importAliases/CompanionObject.kt.after

@@ -0,0 +1,7 @@
+import java.sql.Date as SqlDate
+
+fun foo() {
+    val v: SqlDate = SqlDate<caret>
+}
+
+// ELEMENT: "SqlDate"

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

@@ -0,0 +1,7 @@
+import kotlin.collections.distinct as unique
+
+fun foo() {
+    listOf(1, 2, 3).<caret>
+}
+
+// ELEMENT: "unique"

idea/idea-completion/testData/handlers/basic/importAliases/ExtensionFun.kt.after

@@ -0,0 +1,7 @@
+import kotlin.collections.distinct as unique
+
+fun foo() {
+    listOf(1, 2, 3).unique()<caret>
+}
+
+// ELEMENT: "unique"

idea/idea-completion/testData/handlers/basic/importAliases/ExtensionVal.kt

@@ -0,0 +1,8 @@
+import java.io.File
+import kotlin.io.extension as ext
+
+fun foo(file: File): String {
+    return file.<caret>
+}
+
+// ELEMENT: "ext"

idea/idea-completion/testData/handlers/basic/importAliases/ExtensionVal.kt.after

@@ -0,0 +1,8 @@
+import java.io.File
+import kotlin.io.extension as ext
+
+fun foo(file: File): String {
+    return file.ext<caret>
+}
+
+// ELEMENT: "ext"

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

@@ -0,0 +1,7 @@
+import kotlin.error as veryBad
+
+fun foo() {
+    v<caret>
+}
+
+// ELEMENT: "veryBad"

idea/idea-completion/testData/handlers/basic/importAliases/TopLevelFun.kt.after

@@ -0,0 +1,7 @@
+import kotlin.error as veryBad
+
+fun foo() {
+    veryBad(<caret>)
+}
+
+// ELEMENT: "veryBad"

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

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

idea/idea-completion/testData/handlers/basic/importAliases/TopLevelVal.kt.after

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

idea/idea-completion/testData/handlers/basic/importAliases/Type.kt

@@ -0,0 +1,5 @@
+import java.util.Date as JavaDate
+
+fun foo(): JavaD<caret>
+
+// ELEMENT: "JavaDate"

idea/idea-completion/testData/handlers/basic/importAliases/Type.kt.after

@@ -0,0 +1,5 @@
+import java.util.Date as JavaDate
+
+fun foo(): JavaDate<caret>
+
+// ELEMENT: "JavaDate"