Add tests for enhanced java signatures based on AbstractResolvedCallsTest.

Refactor AbstractResolvedCallsTest to support multiple carets (multiple methods being tested  for resolve) in testdata file.

compiler/testData/resolvedCalls/enhancedSignatures/optional/optionalIfPresent.kt

@@ -0,0 +1,9 @@
+import java.util.*
+
+fun use(v: Optional<String>) {
+    v.<caret>ifPresent { value ->  }
+}
+
+fun use2(v: Optional<String?>) {
+    v.<caret>ifPresent { value ->  }
+}