Adding WiFi power saving mode setting #644

Job	Run time
tests (ubuntu-latest, tests)	29s
build (ubuntu-latest, noradio)	2m 0s
tests (macos-latest, tests)	27s
build (ubuntu-latest, wifi)	2m 15s
tests (windows-latest, tests_nosan)	1m 22s
build (ubuntu-latest, bt)	2m 13s
build (macos-latest, noradio)	1m 44s
build (macos-latest, wifi)	1m 37s
build (macos-latest, bt)	1m 50s
build (windows-latest, noradio)	5m 27s
build (windows-latest, wifi)	5m 55s
build (windows-latest, bt)	5m 6s
	30m 25s

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