[lldb] Add missing StringExtras.h includes

In preparation for removing the #include "llvm/ADT/StringExtras.h"
from the header to source file of llvm/Support/Error.h, first add in
all the missing includes that were previously included transitively
through this header.

This is fixing all files missed in b0abd48, 39d8e6e,
a11efd4, and 5551657.

Differential Revision: https://reviews.llvm.org/D155018

Author: elliotgoodrich

lldb/tools/lldb-vscode/VSCode.cpp

@@ -14,6 +14,7 @@
 
 #include "LLDBUtils.h"
 #include "VSCode.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/FormatVariadic.h"
 
 #if defined(_WIN32)