gh-88473: Implement fast path in date.today() for date types

[StanFromIreland]

Other suggested implementations are not as backward compatible.

$ ./python -m timeit -s 'from datetime import date' 'date.today()'
1000000 loops, best of 5: 271 nsec per loop
$ python3.14 -m timeit -s 'from datetime import date' 'date.today()'
200000 loops, best of 5: 1.36 usec per loop

~5x faster for date types

• Issue: date.today() is half as fast as datetime.now().date() #88473

[picnixz]

Are the benchmarks realised on a PGO build or a debug build? or maybe PGO+LTO? or just release build?

[StanFromIreland]

Both are just plain builds. python3.14 is from the morning but I doubt the few commits matter.

[picnixz]

By plain builds, do you mean with or withou --with-pydebug? I assume without so it's probably release builds so it should be fine. But please the configure flags

[StanFromIreland]

@pganssle can you take a look at this?