Allow setting breakpoints in objc++ files (#159779)

With the released version of the lldb-dap extension, I have to set
breakpoints in objcpp (*.mm) files via the debug console (b
Myfile.mm:123) or change the detected file type in VSCode to objc or
cpp. VSCode should allow setting breakpoints in objcpp files with
vscode-lldb with this change to the package.json

Author: jcaselman-keysight

lldb/tools/lldb-dap/package.json

@@ -350,6 +350,9 @@
       {
         "language": "objective-c"
       },
+      {
+        "language": "objective-cpp"
+      },
       {
         "language": "objectpascal"
       },
@@ -378,6 +381,7 @@
           "fortran-modern",
           "nim",
           "objective-c",
+          "objective-cpp",
           "objectpascal",
           "pascal",
           "rust",