Replace imp module with importlib for Python 3.12+

The imp module has been deprecated in Python 3.10+ and removed in Python
3.12, so replace its usage with importlib to maintain compatibility with
newer Python versions. This change updates module loading logic to use
importlib.util functions (spec_from_file_location, module_from_spec,
etc.) which are the recommended replacements for imp's functionality.

Bug: 455210782,336329417
Change-Id: Id69d06b0d663e319cdd097c5715a2b80e2837406
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/7082166
Reviewed-by: Peng Zhou <zhoupeng.1996@bytedance.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Ho Cheung <hocheung@chromium.org>
Reviewed-by: Mikhail Khokhlov <khokhlov@google.com>
Commit-Queue: Peng Zhou <zhoupeng.1996@bytedance.com>

• telemetry/telemetry/core/util.py[diff]