fix(python): handle old-style module loaders such that we can still lazy load them #5331
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Closes #5326.
The error comes about because Databricks customises their pandas loader but uses the old-style
load_modulemethod (deprecated all the way back in py3.4) instead of the currentexec_module. This patch upgrades any loaders like this such that they can be passed intoimportlib.util.LazyLoaderwithout issue.Had to sign-up for a "community edition" Databricks environment to prove that this works (see this published notebook) :)