[$] Disabling Python's lazy imports from the command line

The advent of lazy imports in the Python language is upon us, now that PEP 810 ("Explicit lazyimports") was accepted by the steeringcouncil and the feature will appear in the upcoming Python 3.15 releasein October. There are a number of good reasons,performance foremost, for wanting to defer spending-perhaps wasting-thetime to do an import before a needed symbol is used. However, there arealso good reasons not to want that behavior, at least in some cases. Thetension between those two positions is what led to an earlier PEP rejection,but it is also playing into a recent discussion of the API used to controllazy imports.