Create from Usage: Make extension functions/properties 'private' by default

#KT-11799 Fixed

idea/testData/quickfix/createFromUsage/createVariable/property/extensionPropertyOnTypeFromAnotherPackage.after.kt

@@ -3,7 +3,7 @@
 
 import package1.A
 
-val package2.A.foo: Any
+private val package2.A.foo: Any<caret>
 
 class X {
     init {

idea/testData/quickfix/createFromUsage/createVariable/property/extensionValOnGroovyType.after.kt

@@ -1,7 +1,7 @@
 // "Create extension property 'A.foo'" "true"
 // ERROR: Unresolved reference: foo
 
-val A.foo: String?
+private val A.foo: String?<caret>
 
 fun test(): String? {
     return A().foo

idea/testData/quickfix/createFromUsage/createVariable/property/extensionValOnJavaType.after.kt

@@ -1,7 +1,7 @@
 // "Create extension property 'A.foo'" "true"
 // ERROR: Unresolved reference: foo
 
-val A.foo: String?
+private val A.foo: String?<caret>
 
 fun test(): String? {
     return A().foo

idea/testData/quickfix/createFromUsage/createVariable/property/extensionWithTypeParameterAsReceiver.kt.after

@@ -2,7 +2,7 @@
 // ERROR: Property must be initialized
 fun consume(n: Int) {}
 
-val <T> T.bar: Int
+private val <T> T.bar: Int
 
 fun <T> foo(t: T) {
     consume(t.bar)

idea/testData/quickfix/createFromUsage/createVariable/property/valOnLibObject.kt.after

@@ -2,7 +2,7 @@
 // ERROR: Property must be initialized
 // WITH_RUNTIME
 
-val Unit.foo: Int
+private val Unit.foo: Int
 
 fun test() {
     val a: Int = Unit.foo

idea/testData/quickfix/createFromUsage/createVariable/property/valOnLibType.kt.after

@@ -4,7 +4,7 @@
 
 class A<T>(val n: T)
 
-val Int.foo: A<Int>
+private val Int.foo: A<Int>
 
 fun test() {
     val a: A<Int> = 2.foo

idea/testData/quickfix/createFromUsage/createVariable/property/varOnLibType.kt.after

@@ -4,7 +4,7 @@
 
 class A<T>(val n: T)
 
-var Int.foo: A<String>
+private var Int.foo: A<String>
 
 fun test() {
     2.foo = A("2")