[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/python_api/sbdata/main.cpp

@@ -0,0 +1,42 @@
+//===-- main.c --------------------------------------------------*- 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 <stdint.h>
+
+struct foo
+{
+    uint32_t a;
+    uint32_t b;
+    float c;
+    foo() : a(0), b(1), c(3.14) {}
+    foo(uint32_t A, uint32_t B, float C) :
+        a(A),
+        b(B),
+        c(C)
+    {}
+};
+
+int main (int argc, char const *argv[])
+{
+    foo* foobar = new foo[2];
+    
+    foobar[0].a = 1;
+    foobar[0].b = 9;
+
+    foobar[1].a = 8;
+    foobar[1].b = 5;
+    
+    foobar[1].b = 7; // set breakpoint here
+    
+    foobar[1].c = 6.28;
+    
+    foo barfoo[] = {foo(1,2,3), foo(4,5,6)};
+    
+    delete[] foobar;
+    
+    return 0;
+}