Fix "Introduce import alias" on extensions

#KT-30214 Fixed

idea/testData/intentions/introduceImportAlias/withReceiver.kt

@@ -0,0 +1,11 @@
+package my.sample
+
+class A
+
+fun A.check() {}
+
+fun test() {
+    val a = A()
+    a.check<caret>()
+    A().check()
+}

idea/testData/intentions/introduceImportAlias/withReceiver.kt.after

@@ -0,0 +1,13 @@
+package my.sample
+
+import my.sample.check as check1
+
+class A
+
+fun A.check() {}
+
+fun test() {
+    val a = A()
+    a.check1()
+    A().check1()
+}

idea/testData/intentions/introduceImportAlias/withReceiver2.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+package my.sample
+
+val Any.foo: Any get() = this
+val Any.bar: Any get() = this
+
+fun test() {
+    1.foo.foo.bar<caret>.foo.bar.toString()
+}

idea/testData/intentions/introduceImportAlias/withReceiver2.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+package my.sample
+
+import my.sample.bar as bar1
+
+val Any.foo: Any get() = this
+val Any.bar: Any get() = this
+
+fun test() {
+    1.foo.foo.bar1.foo.bar1.toString()
+}

idea/testData/intentions/introduceImportAlias/withReceiver3.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+package my.sample
+
+fun test() {
+    0.let { true }.let<caret> { println(it) }
+}

idea/testData/intentions/introduceImportAlias/withReceiver3.kt.after

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+package my.sample
+
+import kotlin.let as let1
+
+fun test() {
+    0.let1 { true }.let1 { println(it) }
+}

idea/testData/intentions/introduceImportAlias/withReceiver4.kt

@@ -0,0 +1,9 @@
+package my.sample
+
+class A
+
+fun A.check() {}
+
+fun test() {
+    (my.sample.A::check<caret>)(A())
+}

idea/testData/intentions/introduceImportAlias/withReceiver4.kt.after

@@ -0,0 +1,11 @@
+package my.sample
+
+import my.sample.check as check1
+
+class A
+
+fun A.check() {}
+
+fun test() {
+    (my.sample.A::check1)(A())
+}