move import of VK 4-bit source quantizer into function #8744
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Summary:
Since this import is at the global scope of the module, this import only works if llama/source_transformation module is being used in libraries where the vulkan dependency is already included.
In some cases this dep can fail to be linked causing export script failures.
Moving the import to where it's actually needed.
Differential Revision: D70268708
cc @mergennachin @cccclai @helunwencser @jackzhxng