[IMP] base: cache property.get(res_id=False)

After installing a bunch more modules including account & some others,
company-dependent fields turn out to be horrendously inefficient (more
or less entirely unbatched): near 80% of runtime is taken by setting
those fields on the partners being created, split 28%/51% between
getting the default values (_default_company_dependent) and setting
them (_inverse_company_dependent).

clear_cache on *every* set_multi call is a bit extreme and cause test
problems (test_pickings_transfer_with_different_uom_and_back_orders
has a super fucky behaviour wrt caching so breaks when clearing the
cache on every set_multi) so only cache the "default"
case (res_id=False) and only clear when specifically setting that.

This makes fetching default values essentially disappear from the
profile.

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