Move: Fix detection of imported declarations and processing of extension usages

#KT-5787 Fixed
 #KT-4959 Fixed

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/after/library/misc.kt

@@ -0,0 +1,7 @@
+package library
+
+open public class B {
+    fun foo(): B = this
+}
+
+fun B.bar(): B = this

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/after/source/some.kt

@@ -0,0 +1,5 @@
+package source
+
+import target.A
+
+fun test1() = target.test(A())

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/after/target/A.kt

@@ -0,0 +1,21 @@
+package target
+
+import library.B
+import library.bar
+
+public class A: B() {
+    fun test() {
+        bar()
+        foo()
+        this.bar()
+        this.foo()
+    }
+}
+
+public fun test(a: A) {
+    a.bar()
+    a.foo()
+    B().foo().bar()
+    B().foo().bar()
+    B().bar().foo()
+}

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/after/target/some.kt

@@ -0,0 +1,3 @@
+package target
+
+fun test2() = test(A())

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/before/library/misc.kt

@@ -0,0 +1,7 @@
+package library
+
+open public class B {
+    fun foo(): B = this
+}
+
+fun B.bar(): B = this

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/before/source/A.kt

@@ -0,0 +1,21 @@
+package source
+
+import library.B
+import library.bar
+
+public class A: B() {
+    fun test() {
+        bar()
+        foo()
+        this.bar()
+        this.foo()
+    }
+}
+
+public fun test(a: A) {
+    a.bar()
+    a.foo()
+    B().foo().bar()
+    library.B().foo().bar()
+    B().bar().foo()
+}

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/before/source/some.kt

@@ -0,0 +1,3 @@
+package source
+
+fun test1() = test(A())

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/before/target/some.kt

@@ -0,0 +1,3 @@
+package target
+
+fun test2() = source.test(source.A())

idea/testData/refactoring/move/kotlin/moveFile/internalReferences/internalReferences.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "source/A.kt",
+  "type": "MOVE_FILES",
+  "targetPackage": "target"
+}