Fix module loading path collision

[avinxshKD]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes load_module() so two Python files with the same basename do not collide in sys.modules.

Ianvs examples often use common names like basemodel.py, accuracy.py, and map.py. The old loader imported by basename after adding the directory to sys.path, so a later file could reuse an earlier module with the same name.

This keeps the existing loader behavior for callers, but loads file paths under a unique internal module name.

Which issue(s) this PR fixes:

Fixes #557

[kubeedge-bot]

Welcome @avinxshKD! It looks like this is your first PR to kubeedge/ianvs 🎉

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Code Review

This pull request updates the load_module function in core/common/utils.py to dynamically load Python modules from file paths using unique module IDs generated via MD5 hashing. The review feedback highlights two important issues: first, importlib.util must be explicitly imported to prevent a runtime AttributeError; second, the code should verify that the module spec is not None before passing it to module_from_spec to avoid a potential ValueError.

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[avinxshKD]

@MooreZheng @hsj576 kept this intentionally small since the bug is isolated to load_module().
Pls take a look, thanks