Debugger tests: add custom library

idea/testData/debugger/tinyApp/customLibrary/oneFunSameFileName/1/1.kt

@@ -0,0 +1,5 @@
+package customLib.oneFunSameFileName
+
+public fun oneFunSameFileNameFun(): Int {
+    return 1
+}

idea/testData/debugger/tinyApp/customLibrary/oneFunSameFileName/2/1.kt

@@ -0,0 +1,5 @@
+package customLib.oneFunSameFileName
+
+public fun oneFunSameFileNameFun2(): Int {
+    return 1
+}