KT-6582 "Expand selection" in string literal should select word in string

#KT-6582 fixed

idea/testData/wordSelection/SimpleStringLiteral2/0.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    println("<caret>foo bar")
+}

idea/testData/wordSelection/SimpleStringLiteral2/1.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    println("<selection><caret>foo</selection> bar")
+}

idea/testData/wordSelection/SimpleStringLiteral2/2.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    println("<selection><caret>foo bar</selection>")
+}

idea/testData/wordSelection/SimpleStringLiteral2/3.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    println(<selection>"<caret>foo bar"</selection>)
+}

idea/testData/wordSelection/TemplateStringLiteral1/2.kt

@@ -1 +1 @@
-val v = "<selection>aaa $x <caret>bbb</selection>"
+val v = "aaa $x<selection> <caret>bbb</selection>"

idea/testData/wordSelection/TemplateStringLiteral1/3.kt

@@ -1 +1 @@
-val v = <selection>"aaa $x <caret>bbb"</selection>
+val v = "<selection>aaa $x <caret>bbb</selection>"

idea/testData/wordSelection/TemplateStringLiteral1/4.kt

@@ -0,0 +1 @@
+val v = <selection>"aaa $x <caret>bbb"</selection>