Remove Inet DNSResolver

[kpschoedel]

Problem

DNSResolver is unused.

Change overview

Remove it.

Testing

CI.

[github-actions]

PR #10725: Size comparison from 447cdd7 to 347b590

16 builds (for k32w, linux, p6, qpg, telink)

platform	target	config	section	447cdd7	347b590	change	% change
k32w	lock-app	k32w061+debug	.bss	69052	69052	0	0.0
			.data	1864	1864	0	0.0
			.text	515536	515536	0	0.0
	shell	k32w061+debug	.bss	55080	55080	0	0.0
			.data	672	672	0	0.0
			.text	357332	357332	0	0.0
	lighting-app	k32w061+se05x+release	.bss	78576	78576	0	0.0
			.data	1900	1900	0	0.0
			.text	614304	614304	0	0.0
linux	all-clusters-app	debug	.bss	52176	52144	-32	-0.1
			.data	978	978	0	0.0
			.data.rel.ro	58688	58688	0	0.0
			.dynamic	592	592	0	0.0
			.got	4080	4080	0	0.0
			.init	27	27	0	0.0
			.init_array	512	512	0	0.0
			.rodata	136373	136373	0	0.0
			.text	1343314	1343314	0	0.0
	chip-tool	debug	.bss	17552	17520	-32	-0.2
			.data	1584	1584	0	0.0
			.data.rel.ro	89344	89344	0	0.0
			.dynamic	592	592	0	0.0
			.got	4344	4344	0	0.0
			.init	27	27	0	0.0
			.init_array	416	416	0	0.0
			.rodata	184476	184476	0	0.0
			.text	3425061	3425061	0	0.0
	ota-provider-app	debug	.bss	37472	37440	-32	-0.1
			.data	752	752	0	0.0
			.data.rel.ro	23176	23176	0	0.0
			.dynamic	592	592	0	0.0
			.got	4008	4008	0	0.0
			.init	27	27	0	0.0
			.init_array	440	440	0	0.0
			.rodata	110024	110024	0	0.0
			.text	1009714	1009714	0	0.0
	ota-requestor-app	debug	.bss	205728	205696	-32	-0.0
			.data	752	752	0	0.0
			.data.rel.ro	24488	24488	0	0.0
			.dynamic	592	592	0	0.0
			.got	4136	4136	0	0.0
			.init	27	27	0	0.0
			.init_array	512	512	0	0.0
			.rodata	128744	128744	0	0.0
			.text	1129298	1129298	0	0.0
	shell	debug	.bss	16072	16072	0	0.0
			.data	242	242	0	0.0
			.data.rel.ro	35120	35120	0	0.0
			.dynamic	592	592	0	0.0
			.got	3496	3496	0	0.0
			.init	27	27	0	0.0
			.init_array	336	336	0	0.0
			.rodata	71823	71823	0	0.0
			.text	569842	569842	0	0.0
	tv-app	debug	.bss	216400	216368	-32	-0.0
			.data	2032	2032	0	0.0
			.data.rel.ro	55872	55872	0	0.0
			.dynamic	592	592	0	0.0
			.got	4400	4400	0	0.0
			.init	27	27	0	0.0
			.init_array	608	608	0	0.0
			.rodata	152264	152264	0	0.0
			.text	1461602	1461602	0	0.0
	bridge-app	debug+rpc	.bss	52912	52880	-32	-0.1
			.data	976	976	0	0.0
			.data.rel.ro	25784	25784	0	0.0
			.dynamic	592	592	0	0.0
			.got	3944	3944	0	0.0
			.init	27	27	0	0.0
			.init_array	400	400	0	0.0
			.rodata	110620	110620	0	0.0
			.text	1051093	1051093	0	0.0
	lighting-app	debug+rpc	.bss	42232	42200	-32	-0.1
			.data	1106	1106	0	0.0
			.data.rel.ro	52496	52496	0	0.0
			.dynamic	608	608	0	0.0
			.got	4104	4104	0	0.0
			.init	27	27	0	0.0
			.init_array	528	528	0	0.0
			.rodata	127825	127825	0	0.0
			.text	1251314	1251314	0	0.0
p6	lock-app	default	.bss	68216	68208	-8	-0.0
			.data	2416	2416	0	0.0
			.heap	962712	962720	8	0.0
			.text	1126552	1126552	0	0.0
qpg	lighting-app	qpg6100+debug	.bss	53552	53552	0	0.0
			.data	996	996	0	0.0
			.text	486624	486624	0	0.0
	lock-app	qpg6100+debug	.bss	52488	52488	0	0.0
			.data	952	952	0	0.0
			.text	462692	462692	0	0.0
	persistent-storage-app	qpg6100+debug	.bss	17778	17778	0	0.0
			.data	280	280	0	0.0
			.text	102704	102704	0	0.0
telink	lighting-app	tlsr9518adk80d	bss	71000	70992	-8	-0.0
			noinit	33216	33216	0	0.0
			text	458318	458318	0	0.0

6 builds (for efr32, mbed)

platform	target	config	section	447cdd7	347b590	change	% change
efr32	lighting-app	BRD4161A	.bss	118036	118028	-8	-0.0
			.data	1800	1800	0	0.0
			.text	782896	782896	0	0.0
	lock-app	BRD4161A	.bss	115892	115884	-8	-0.0
			.data	1760	1760	0	0.0
			.text	762040	762040	0	0.0
	window-app	BRD4161A	.bss	116212	116204	-8	-0.0
			.data	1764	1764	0	0.0
			.text	762948	762948	0	0.0
	lighting-app	BRD4161A+rpc	.bss	131364	131356	-8	-0.0
			.data	1852	1852	0	0.0
			.text	762636	762636	0	0.0
mbed	lighting-app	CY8CPROTO_062_4343W+release	.bss	172164	172092	-72	-0.0
			.data	5464	5464	0	0.0
			.heap	858816	858888	72	0.0
			.text	1220144	1220144	0	0.0
	lock-app	CY8CPROTO_062_4343W+release	.bss	171084	171012	-72	-0.0
			.data	5432	5432	0	0.0
			.heap	859928	860000	72	0.0
			.text	1198040	1198040	0	0.0

12 builds (for esp32, nrfconnect)

platform	target	config	section	447cdd7	347b590	change	% change
esp32	all-clusters-app	c3devkit	.dram0.bss	60296	60288	-8	-0.0
			.dram0.data	16192	16192	0	0.0
			.flash.rodata	198992	198992	0	0.0
			.flash.text	873186	873186	0	0.0
			.iram0.text	57330	57330	0	0.0
		m5stack	.dram0.bss	62792	62792	0	0.0
			.dram0.data	32084	32084	0	0.0
			.flash.rodata	207736	207736	0	0.0
			.flash.text	904423	904423	0	0.0
			.iram0.text	125115	125115	0	0.0
nrfconnect	lighting-app	nrf52840dk_nrf52840	bss	112332	112328	-4	-0.0
			rodata	97776	97776	0	0.0
			text	577660	577660	0	0.0
	lock-app	nrf52840dk_nrf52840	bss	111348	111344	-4	-0.0
			rodata	94112	94112	0	0.0
			text	559160	559160	0	0.0
	pigweed-app	nrf52840dk_nrf52840	bss	51772	51772	0	0.0
			rodata	45772	45772	0	0.0
			text	339392	339392	0	0.0
	pump-app	nrf52840dk_nrf52840	bss	111416	111416	0	0.0
			rodata	95092	95092	0	0.0
			text	562312	562312	0	0.0
	pump-controller-app	nrf52840dk_nrf52840	bss	111356	111356	0	0.0
			rodata	94172	94172	0	0.0
			text	558952	558952	0	0.0
	shell	nrf52840dk_nrf52840	bss	107316	107316	0	0.0
			rodata	71640	71640	0	0.0
			text	519032	519032	0	0.0
	lighting-app	nrf52840dk_nrf52840+rpc	bss	108572	108568	-4	-0.0
			rodata	88560	88560	0	0.0
			text	550864	550864	0	0.0
		nrf5340dk_nrf5340_cpuapp	bss	113704	113704	0	0.0
			rodata	93016	93016	0	0.0
			text	507124	507124	0	0.0
	lock-app	nrf5340dk_nrf5340_cpuapp	bss	112720	112720	0	0.0
			rodata	89372	89372	0	0.0
			text	488616	488616	0	0.0
	shell	nrf5340dk_nrf5340_cpuapp	bss	108300	108300	0	0.0
			rodata	66284	66284	0	0.0
			text	439632	439632	0	0.0