Resource Bundles: Enable property key completion in string literals

#KT-6946 Fixed

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

@@ -0,0 +1,7 @@
+import org.jetbrains.annotations.PropertyKey
+
+fun message(@PropertyKey(resourceBundle = "TestBundle") key: String) = key
+
+fun test() {
+    message("foo.<caret>b")
+}

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

@@ -0,0 +1,5 @@
+package org.jetbrains.annotations
+
+@Retention(AnnotationRetention.BINARY)
+@Target(AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.LOCAL_VARIABLE, AnnotationTarget.FIELD)
+public annotation class PropertyKey(public val resourceBundle: String)

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

@@ -0,0 +1,7 @@
+import org.jetbrains.annotations.PropertyKey
+
+fun message(@PropertyKey(resourceBundle = "TestBundle") key: String) = key
+
+fun test() {
+    message("foo.barb")
+}

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

@@ -0,0 +1,7 @@
+import org.jetbrains.annotations.PropertyKey
+
+fun message(@PropertyKey(resourceBundle = "TestBundle") key: String) = key
+
+fun test() {
+    message("foo.<caret>b")
+}

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

@@ -0,0 +1,5 @@
+package org.jetbrains.annotations
+
+@Retention(AnnotationRetention.BINARY)
+@Target(AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.LOCAL_VARIABLE, AnnotationTarget.FIELD)
+public annotation class PropertyKey(public val resourceBundle: String)

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

@@ -0,0 +1,7 @@
+import org.jetbrains.annotations.PropertyKey
+
+fun message(@PropertyKey(resourceBundle = "TestBundle") key: String) = key
+
+fun test() {
+    message("foo.bar")
+}

idea/idea-completion/testData/handlers/multifile/TestBundle.properties

@@ -0,0 +1,2 @@
+foo.bar = 1
+bar.baz = 2