FIR: support type alias resolve

compiler/testData/fir/resolve/NestedOfAliasedType.kt

@@ -0,0 +1,9 @@
+abstract class A {
+    abstract class Nested
+}
+
+typealias TA = A
+
+class B : TA() {
+    class NestedInB : Nested()
+}

compiler/testData/fir/resolve/NestedOfAliasedType.txt

@@ -0,0 +1,12 @@
+FILE: NestedOfAliasedType.kt
+    unknown abstract class A() {
+        unknown abstract class Nested() {
+        }
+
+    }
+    unknown final typealias TA = R/<root>.A/
+    unknown final class B() : R/<root>.TA = <root>.A/ {
+        unknown final class NestedInB() : R/<root>.A.Nested/ {
+        }
+
+    }

compiler/testData/fir/resolve/simpleTypeAlias.kt

@@ -0,0 +1,5 @@
+interface B
+
+typealias C = B
+
+class D : C

compiler/testData/fir/resolve/simpleTypeAlias.txt

@@ -0,0 +1,6 @@
+FILE: simpleTypeAlias.kt
+    unknown final interface B() {
+    }
+    unknown final typealias C = R/<root>.B/
+    unknown final class D() : R/<root>.C = <root>.B/ {
+    }