Add lexer test runner and whitespace characters tests

Whitespace characters for the tests are U+000B, U+000C, U+000D, U+0085, U+2028, U+2029

compiler/testData/lexer/kotlin/whitespaceCharacters/verticalTab/verticalTabInStringLiterals.kt

@@ -0,0 +1,20 @@
+val x1 = ".  ."
+
+val x2 = ".   ."
+
+val x3 = ".   ."
+
+val x4 = ''
+
+val x5 = """.  ."""
+
+val x6 = """.   ."""
+
+val x7 = """.   ."""
+
+val x8 = """.
+."""
+
+val x9 = """.
+
+."""