Deserialize annotations from package$src files if needed

For top-level members, we now write a FQ name of the package$src class which
has the member's annotations, and read the correct file in deserialization

compiler/testData/loadKotlin/annotations/packageMembers/PropertyField.kt

@@ -0,0 +1,5 @@
+package test
+
+annotation class Anno
+
+[Anno] var property: Int = 42

compiler/testData/loadKotlin/annotations/packageMembers/PropertyField.txt

@@ -0,0 +1,9 @@
+package test
+
+test.Anno() internal var property: jet.Int
+    internal fun <get-property>(): jet.Int
+    internal fun <set-property>(/*0*/ <set-?>: jet.Int): jet.Unit
+
+internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno()
+}

compiler/testData/loadKotlin/annotations/packageMembers/PropertyNoField.kt

@@ -0,0 +1,6 @@
+package test
+
+annotation class Anno
+
+[Anno] val property: Int
+    get() = 42

compiler/testData/loadKotlin/annotations/packageMembers/PropertyNoField.txt

@@ -0,0 +1,8 @@
+package test
+
+test.Anno() internal val property: jet.Int
+    internal fun <get-property>(): jet.Int
+
+internal final annotation class Anno : jet.Annotation {
+    /*primary*/ public constructor Anno()
+}