Add @functools.lru_cache decorator for get_binding_version() (#512)

>>> 35.381859/0.004149
8527.804049168473

$ git stash
$ python test_slowness.py 100000
driver.cuDriverGetVersion() 12060
cuda_utils.get_binding_version() (12, 8)
driver.cuDriverGetVersion()
    0.023946 seconds for 100000 iterations
    0.24 µs per call
cuda_utils.get_binding_version()
    35.381859 seconds for 100000 iterations
    353.82 µs per call

$ git stash pop
$ python test_slowness.py 100000
driver.cuDriverGetVersion() 12060
cuda_utils.get_binding_version() (12, 8)
driver.cuDriverGetVersion()
    0.022644 seconds for 100000 iterations
    0.23 µs per call
cuda_utils.get_binding_version()
    0.004149 seconds for 100000 iterations
    0.04 µs per call

Author: rwgk

cuda_core/cuda/core/experimental/_utils/cuda_utils.py

@@ -182,6 +182,7 @@ def is_nested_sequence(obj):
     return is_sequence(obj) and any(is_sequence(elem) for elem in obj)
 
 
+@functools.lru_cache
 def get_binding_version():
     try:
         major_minor = importlib.metadata.version("cuda-bindings").split(".")[:2]