Cache get_native_microarchitecture

No tests for this one, just a sample run:

In [1]: import importlib

In [2]: mod = importlib.import_module("src.mpsd_software_manager.mpsd_software")

In [3]: mod.set_up_logging('INFO')

In [4]: mod.get_native_microarchitecture()
2023-06-28 11:46:14,057    INFO  |  !<meta>microarchitecture:zen3</meta>!
Out[4]: 'zen3'

In [5]: mod.get_native_microarchitecture()
Out[5]: 'zen3'

Closes #20 (closed)