Add `cuda.core.utils.ProgramCacheResource`

[leofang]

This is the ABC class that all concrete cache classes should inherit/overwrite:

class ProgramCacheResource(abc.ABC):

 @abc.abstractmethod
 def __getitem__(self, key: Any) -> Module:
 """Retrieve the cached Module instance. key should be a hashable
 object.
 """
 ...

 @abc.abstractmethod
 def __setitem__(self, key: Any, val: Module):
 """Cache a Module instance. key should be a hashable object.
 """
 ...