Code completion for string templates after simple name + dot

idea/idea-completion/testData/basic/common/inStringLiterals/StringTemplate1.kt

@@ -0,0 +1,6 @@
+fun foo(param: String) {
+    val s = "$<caret>bla-bla-bla"
+}
+
+// EXIST: foo
+// EXIST: param

idea/idea-completion/testData/basic/common/inStringLiterals/StringTemplate2.kt

@@ -0,0 +1,6 @@
+fun foo(param: String) {
+    val s = "${<caret>}"
+}
+
+// EXIST: foo
+// EXIST: param

idea/idea-completion/testData/basic/common/inStringLiterals/StringTemplateDot.kt

@@ -0,0 +1,7 @@
+fun foo(param: String) {
+    val s = "$param.<caret>bla-bla-bla"
+}
+
+// EXIST: { itemText: "length", attributes: "" }
+// EXIST: { itemText: "hashCode", attributes: "" }
+// EXIST: { itemText: "capitalize", attributes: "bold" }

idea/idea-completion/testData/basic/common/inStringLiterals/StringTemplateDotSomething.kt

@@ -0,0 +1,7 @@
+fun foo(param: String) {
+    val s = "$param.l<caret>bla-bla-bla"
+}
+
+// EXIST: { itemText: "length", attributes: "" }
+// ABSENT: hashCode
+// EXIST: { itemText: "lastIndex", attributes: "" }