[lldb/plugin] Fix heap-use-after-free in ScriptedProcess::ReadMemory

This commit should fix a heap-use-after-free bug that was caught by the
sanitizer bot.

The issue is that we were reading memory from a second target into a
`SBData` object in Python, that was passed to lldb's internal
`ScriptedProcess::DoReadMemory` C++ method.

The ScriptedPythonInterface then extracts the underlying `DataExtractor`
from the `SBData` object, and is used to read the memory with the
appropriate address size and byte order.

Unfortunately, it seems that even though the DataExtractor object was
still valid, it pointed to invalid, possibly garbage-collected memory
from Python.

To mitigate this, the patch uses `SBData::SetDataWithOwnership` to copy
the pointed buffer to lldb's heap memory which prevents the
use-after-free error.

rdar://84511405

Differential Revision: https://reviews.llvm.org/D115654

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

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