[lldb] Add support for negative integer to {SB,}StructuredData

This patch refactors the `StructuredData::Integer` class to make it
templated, makes it private and adds 2 public specialization for both
`int64_t` & `uint64_t` with a public type aliases, respectively
`SignedInteger` & `UnsignedInteger`.

It adds new getter for signed and unsigned interger values to the
`StructuredData::Object` base class and changes the implementation of
`StructuredData::Array::GetItemAtIndexAsInteger` and
`StructuredData::Dictionary::GetValueForKeyAsInteger` to support signed
and unsigned integers.

This patch also adds 2 new `Get{Signed,Unsigned}IntegerValue` to the
`SBStructuredData` class and marks `GetIntegerValue` as deprecated.

Finally, this patch audits all the caller of `StructuredData::Integer`
or `StructuredData::GetIntegerValue` to use the proper type as well the
various tests that uses `SBStructuredData.GetIntegerValue`.

rdar://105575764

Differential Revision: https://reviews.llvm.org/D150485

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

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

@@ -152,7 +152,7 @@ lldb::offset_t ScriptedProcessPythonInterface::WriteMemoryAtAddress(
   if (py_error.Fail())
     error = py_error;
 
-  return obj->GetIntegerValue(LLDB_INVALID_OFFSET);
+  return obj->GetUnsignedIntegerValue(LLDB_INVALID_OFFSET);
 }
 
 StructuredData::ArraySP ScriptedProcessPythonInterface::GetLoadedImages() {
@@ -173,7 +173,7 @@ lldb::pid_t ScriptedProcessPythonInterface::GetProcessID() {
   if (!CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, obj, error))
     return LLDB_INVALID_PROCESS_ID;
 
-  return obj->GetIntegerValue(LLDB_INVALID_PROCESS_ID);
+  return obj->GetUnsignedIntegerValue(LLDB_INVALID_PROCESS_ID);
 }
 
 bool ScriptedProcessPythonInterface::IsAlive() {