FIR IDE: Add more correct importing of the callables

Now we use scopes to decide if the callable really needs to be inserted

idea/idea-completion/testData/handlers/basic/ExtensionPropertyFromSameFile.kt

@@ -0,0 +1,12 @@
+// FIR_COMPARISON
+package test
+
+class AClass
+
+val AClass.ext get() = this
+
+fun usage(a: AClass) {
+    a.ex<caret>
+}
+
+// ELEMENT: ext

idea/idea-completion/testData/handlers/basic/ExtensionPropertyFromSameFile.kt.after

@@ -0,0 +1,12 @@
+// FIR_COMPARISON
+package test
+
+class AClass
+
+val AClass.ext get() = this
+
+fun usage(a: AClass) {
+    a.ext<caret>
+}
+
+// ELEMENT: ext

idea/idea-completion/testData/handlers/multifile/ExtensionPropertyInSamePackageNoImport-1.kt

@@ -0,0 +1,6 @@
+// FIR_COMPARISON
+package first
+
+fun foo() {
+    "".extensi<caret>
+}

idea/idea-completion/testData/handlers/multifile/ExtensionPropertyInSamePackageNoImport-2.kt

@@ -0,0 +1,4 @@
+package first
+
+val String.extensionProp: Int
+    get() = 1

idea/idea-completion/testData/handlers/multifile/ExtensionPropertyInSamePackageNoImport.kt.after

@@ -0,0 +1,6 @@
+// FIR_COMPARISON
+package first
+
+fun foo() {
+    "".extensionProp<caret>
+}

idea/idea-completion/testData/handlers/multifile/TopLevelPropertyInSamePackageNoImport-1.kt

@@ -0,0 +1,6 @@
+// FIR_COMPARISON
+package some
+
+fun other() {
+    somePr<caret>
+}

idea/idea-completion/testData/handlers/multifile/TopLevelPropertyInSamePackageNoImport-2.kt

@@ -0,0 +1,4 @@
+// FIR_COMPARISON
+package some
+
+val someProp: Int = 1

idea/idea-completion/testData/handlers/multifile/TopLevelPropertyInSamePackageNoImport.kt.after

@@ -0,0 +1,6 @@
+// FIR_COMPARISON
+package some
+
+fun other() {
+    someProp<caret>
+}