Enable caching of kernels in the `numba_dpex.experimental.dispatcher.KernelDispatcher` class.

[diptorupd]

The new numba_dpex.experimental.dispatcher.KernelDispatcher does not support caching of compiled SPIR-V kernels. The feature should be enabled to use the existing Numba machinery.

References:
[1] https://numba.readthedocs.io/en/stable/cuda/caching.html
[2] https://numba.readthedocs.io/en/stable/developer/caching.html