[lldb] Fix Scripted ProcessLaunchInfo Argument nullptr deref

This patch adds a new `StructuredData::Dictionary` constructor that
takes a `StructuredData::ObjectSP` as an argument. This is used to pass
the opaque_ptr from the `SBStructuredData` used to initialize a
ScriptedProecss, to the `ProcessLaunchInfo` class.

This also updates `SBLaunchInfo::SetScriptedProcessDictionary` to
reflect the formentionned changes which solves the nullptr deref.

Differential Revision: https://reviews.llvm.org/D112107



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