Allow null NetworkCredentials in commissionDevice()

[g-coppock]

For IP commissioning, no credentials should be added, but currently the
Java layer requires either a Thread or Wi-Fi network. The underlying
commissioner logic already has safeguards to ensure that a network is
provided unless we are doing IP commissioning.

Testing

Tested locally, providing null credentials during IP commissioning on Android

[github-actions]

PR #13655: Size comparison from be806bb to 2ec4e56

Full report (21 builds for efr32, esp32, k32w, linux, mbed, p6, qpg, telink)

platform	target	config	section	be806bb	2ec4e56	change	% change
efr32	lighting-app	BRD4161A	(read only)	834948	834948	0	0.0
			(read/write)	127636	127636	0	0.0
			.bss	125744	125744	0	0.0
			.data	1892	1892	0	0.0
			.text	834940	834940	0	0.0
		BRD4161A+rpc	(read only)	822352	822352	0	0.0
			(read/write)	144296	144296	0	0.0
			.bss	142304	142304	0	0.0
			.data	1992	1992	0	0.0
			.text	822344	822344	0	0.0
	window-app	BRD4161A	(read only)	805536	805536	0	0.0
			(read/write)	126328	126328	0	0.0
			.bss	124480	124480	0	0.0
			.data	1844	1844	0	0.0
			.text	805528	805528	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	912452	912452	0	0.0
			(read/write)	1316698	1316698	0	0.0
			.dram0.bss	70528	70528	0	0.0
			.dram0.data	14292	14292	0	0.0
			.flash.rodata	178384	178384	0	0.0
			.flash.text	912452	912452	0	0.0
			.iram0.text	62056	62056	0	0.0
		m5stack	(read only)	961295	961295	0	0.0
			(read/write)	448856	448856	0	0.0
			.dram0.bss	74984	74984	0	0.0
			.dram0.data	34072	34072	0	0.0
			.flash.rodata	207672	207672	0	0.0
			.flash.text	955911	955911	0	0.0
			.iram0.text	123399	123399	0	0.0
k32w	light	k32w061+release	(read/write)	659156	659156	0	0.0
			.bss	77136	77136	0	0.0
			.data	1860	1860	0	0.0
			.text	574360	574360	0	0.0
	lock	k32w061+release	(read/write)	661888	661888	0	0.0
			.bss	77432	77432	0	0.0
			.data	1880	1880	0	0.0
			.text	576776	576776	0	0.0
linux	chip-tool-ipv6only	arm64	(read only)	8090660	8090660	0	0.0
			(read/write)	373409	373409	0	0.0
			.bss	55217	55217	0	0.0
			.data	1112	1112	0	0.0
			.data.rel.ro	248088	248088	0	0.0
			.dynamic	560	560	0	0.0
			.got	65296	65296	0	0.0
			.init	24	24	0	0.0
			.init_array	168	168	0	0.0
			.rodata	421100	421100	0	0.0
			.text	6873764	6873764	0	0.0
	thermostat-no-ble	arm64	(read only)	2044156	2044156	0	0.0
			(read/write)	145985	145985	0	0.0
			.bss	65089	65089	0	0.0
			.data	896	896	0	0.0
			.data.rel.ro	73016	73016	0	0.0
			.dynamic	560	560	0	0.0
			.got	4048	4048	0	0.0
			.init	24	24	0	0.0
			.init_array	304	304	0	0.0
			.rodata	129932	129932	0	0.0
			.text	1699616	1699616	0	0.0
mbed	all-clusters-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2350176	2350176	0	0.0
			.bss	189220	189220	0	0.0
			.data	5328	5328	0	0.0
			.text	1312752	1312752	0	0.0
	lighting-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2334632	2334632	0	0.0
			.bss	180760	180760	0	0.0
			.data	5576	5576	0	0.0
			.text	1297232	1297232	0	0.0
	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2304984	2304984	0	0.0
			.bss	179768	179768	0	0.0
			.data	5552	5552	0	0.0
			.text	1267584	1267584	0	0.0
	pigweed-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	1139712	1139712	0	0.0
			.bss	11756	11756	0	0.0
			.data	4368	4368	0	0.0
			.text	103096	103096	0	0.0
	shell	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2054464	2054464	0	0.0
			.bss	156876	156876	0	0.0
			.data	4864	4864	0	0.0
			.text	1017064	1017064	0	0.0
p6	all-clusters-app	default	(read/write)	2405304	2405304	0	0.0
			.bss	117556	117556	0	0.0
			.data	2608	2608	0	0.0
			.text	1363568	1363568	0	0.0
	light-app	default	(read/write)	2330160	2330160	0	0.0
			.bss	106128	106128	0	0.0
			.data	2400	2400	0	0.0
			.text	1288424	1288424	0	0.0
	lock-app	default	(read/write)	2299168	2299168	0	0.0
			.bss	104976	104976	0	0.0
			.data	2352	2352	0	0.0
			.text	1257432	1257432	0	0.0
qpg	lighting-app	qpg6105+debug	(read only)	565160	565160	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	89960	89960	0	0.0
			.data	1056	1056	0	0.0
			.text	559840	559840	0	0.0
	lock-app	qpg6105+debug	(read only)	515572	515572	0	0.0
			(read/write)	146936	146936	0	0.0
			.bss	88584	88584	0	0.0
			.data	980	980	0	0.0
			.text	510252	510252	0	0.0
	persistent-storage-app	qpg6105+debug	(read only)	106848	106848	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	38512	38512	0	0.0
			.data	288	288	0	0.0
			.text	101528	101528	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	840902	840902	0	0.0
			bss	87316	87316	0	0.0
			noinit	37160	37160	0	0.0
			text	587854	587854	0	0.0

[andy31415]

fast track: platform specific change