Allow path template loaders to be ... Paths

[akaIDIOT]

After looking at the type conversions in #132, it looked silly that the loaders in the load_order were required to be strings. Paths should be equally valid.

[akaIDIOT]

Stack level for this was checked manually, warning now points to the line calling load_name(...).

[github-actions]

Comparing median (lower is better) metric of benchmarks between this PR's target (8055282) and the HEAD of this PR (59a0374):

	3.10	3.11	3.12	3.13	3.14	PyPy 3.10	PyPy 3.11
test_benchmark_get	+1%	-1%	+2%	-2%	-0%	+3%	+1%
test_benchmark_get_dotted	+1%	+4%	+0%	-1%	+1%	+1%	-2%
test_benchmark_getattr	+3%	-1%	+3%	-2%	+1%	+2%	+3%
test_benchmark_getitem	+1%	-1%	+2%	-2%	+2%	+1%	+2%
test_benchmark_getitem_dotted	-0%	-0%	+0%	-0%	+1%	+4%	+0%
test_benchmark_init_full_overlap	-1%	-0%	-0%	-1%	+1%	-1%	+1%
test_benchmark_init_no_overlap	+0%	+1%	+0%	-0%	+1%	-1%	+1%
test_benchmark_init_partial_overlap	-0%	+0%	+0%	-0%	+1%	-1%	+1%
test_benchmark_reference_chain	-1%	-0%	+1%	+0%	+1%	-2%	-2%
test_benchmark_splat_args	-1%	-0%	+0%	-1%	+2%	-2%	+0%
test_benchmark_spread_kwargs	-2%	+1%	+2%	-2%	+1%	-2%	+0%

(This comment will be updated on subsequent pushes)