[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdir -p lldb/test/API/{test_runner/test,tools/lldb-{server,vscode}}
mv lldb/packages/Python/lldbsuite/test/test_runner/test lldb/test/API/test_runner
for d in $(find lldb/packages/Python/lldbsuite/test/* -maxdepth 0 -type d | egrep -v "make|plugins|test_runner|tools"); do mv $d lldb/test/API; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-vscode -maxdepth 1 -mindepth 1 | grep -v ".py"); do mv $d lldb/test/API/tools/lldb-vscode; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-server -maxdepth 1 -mindepth 1 | egrep -v "gdbremote_testcase.py|lldbgdbserverutils.py|socket_packet_pump.py"); do mv $d lldb/test/API/tools/lldb-server; done
```

lldb/packages/Python/lldbsuite/__init__.py and lldb/test/API/lit.cfg.py were also updated with the new directory structure.

Reviewers: labath, JDevlieghere

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71151

lldb/test/API/functionalities/data-formatter/data-formatter-cpp/main.cpp

@@ -0,0 +1,120 @@
+//===-- main.cpp ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef float RealNumber; // should show as char
+typedef RealNumber Temperature; // should show as float
+typedef RealNumber Speed; // should show as hex
+
+typedef int Counter; // should show as int
+typedef int BitField; // should show as hex
+
+typedef BitField SignalMask; // should show as hex
+typedef BitField Modifiers; // should show as hex
+
+typedef Counter Accumulator; // should show as int
+
+typedef int Type1; // should show as char
+typedef Type1 Type2; // should show as hex
+typedef Type2 Type3; // should show as char
+typedef Type3 Type4; // should show as char
+
+typedef int ChildType; // should show as int
+typedef int AnotherChildType; // should show as int
+
+struct Point {
+    int x;
+    int y;
+    Point(int X = 3, int Y = 2) : x(X), y(Y) {}
+};
+
+typedef float ShowMyGuts;
+
+struct i_am_cool
+{
+	int integer;
+	ShowMyGuts floating;
+	char character;
+	i_am_cool(int I, ShowMyGuts F, char C) :
+    integer(I), floating(F), character(C) {}
+	i_am_cool() : integer(1), floating(2), character('3') {}
+    
+};
+
+struct i_am_cooler
+{
+	i_am_cool first_cool;
+	i_am_cool second_cool;
+	ShowMyGuts floating;
+	
+	i_am_cooler(int I1, int I2, float F1, float F2, char C1, char C2) :
+    first_cool(I1,F1,C1),
+    second_cool(I2,F2,C2),
+    floating((F1 + F2)/2) {}
+};
+
+struct IUseCharStar
+{
+	const char* pointer;
+	IUseCharStar() : pointer("Hello world") {}
+};
+
+int main (int argc, const char * argv[])
+{
+    
+    int iAmInt = 1;
+    const float& IAmFloat = float(2.45);
+
+    RealNumber RNILookChar = 3.14;
+    Temperature TMILookFloat = 4.97;
+    Speed SPILookHex = 5.55;
+    
+    Counter CTILookInt = 6;
+    BitField BFILookHex = 7;
+    SignalMask SMILookHex = 8;
+    Modifiers MFILookHex = 9;
+    
+    Accumulator* ACILookInt = new Accumulator(10);
+    
+    const Type1& T1ILookChar = 11;
+    Type2 T2ILookHex = 12;
+    Type3 T3ILookChar = 13;
+    Type4 T4ILookChar = 14;
+    
+    AnotherChildType AHILookInt = 15;
+    
+    Speed* SPPtrILookHex = new Speed(16);
+    
+    Point iAmSomewhere(4,6);
+    
+	i_am_cool *cool_pointer = (i_am_cool*)malloc(sizeof(i_am_cool)*3);
+	cool_pointer[0] = i_am_cool(3,-3.141592,'E');
+	cool_pointer[1] = i_am_cool(0,-3.141592,'E');
+	cool_pointer[2] = i_am_cool(0,-3.141592,'E');
+    
+    i_am_cool cool_array[5];
+    
+    cool_array[3].floating = 5.25;
+    cool_array[4].integer = 6;
+    cool_array[2].character = 'Q';
+    
+    int int_array[] = {1,2,3,4,5};
+    
+    IUseCharStar iEncapsulateCharStar;
+    
+    char  strarr[32] = "Hello world!";
+    char* strptr     = "Hello world!";
+    
+    i_am_cooler the_coolest_guy(1,2,3.14,6.28,'E','G');
+        
+    return 0; // Set break point at this line.
+}
+