[lldb/Plugins] Add ScriptedProcess::GetCapabilities affordance (NFC)

This patch introduces a new method to the Scripted Process interface,
GetCapabilities.

This returns a dictionary that contains a list of flags that the
ScriptedProcess instance supports. This can be used for instance, to
force symbol lookup, when loading dynamic libraries in the scripted process.

Differential Revision: https://reviews.llvm.org/D142059

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/source/Plugins/ScriptInterpreter/Python/ScriptedProcessPythonInterface.h

@@ -29,6 +29,8 @@ public:
                      StructuredData::DictionarySP args_sp,
                      StructuredData::Generic *script_obj = nullptr) override;
 
+  StructuredData::DictionarySP GetCapabilities() override;
+
   Status Launch() override;
 
   Status Resume() override;