[ESP32] Handle NVS key with length > 15

[shubhamdp]

Problem

• ESP-IDF can not handle NVS key with length > 15 bytes (not including null terminator)

Change overview

• Hash the key using SHA1 algorithm and convert the first 8 bytes to hex string and use it as key.

Testing

• Made sure that the case resumption was working

[shubhamdp]

@tcarmelveilleux @bzbarsky-apple @andy31415 thought!

[github-actions]

PR #18604: Size comparison from 70e259c to 2a8689a

Increases (2 builds for esp32)

platform	target	config	section	70e259c	2a8689a	change	% change
esp32	all-clusters-app	c3devkit	(read only)	1000894	1001090	196	0.0
			(read/write)	1478218	1478250	32	0.0
			.flash.rodata	209960	209992	32	0.0
			.flash.text	1000894	1001090	196	0.0
		m5stack	(read only)	1056019	1056203	184	0.0
			(read/write)	480212	480244	32	0.0
			.flash.rodata	240288	240320	32	0.0
			.flash.text	1050635	1050819	184	0.0

Full report (21 builds for cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	70e259c	2a8689a	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	625570	625570	0	0.0
			.app_xip_area	529184	529184	0	0.0
			.bss	79028	79028	0	0.0
			.data	708	708	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	628542	628542	0	0.0
			.app_xip_area	533612	533612	0	0.0
			.bss	77604	77604	0	0.0
			.data	672	672	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	570998	570998	0	0.0
			.app_xip_area	466352	466352	0	0.0
			.bss	87024	87024	0	0.0
			.data	584	584	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	917676	917676	0	0.0
			(read/write)	133244	133244	0	0.0
			.bss	131184	131184	0	0.0
			.data	2060	2060	0	0.0
			.text	917668	917668	0	0.0
		BRD4161A+rpc	(read only)	951848	951848	0	0.0
			(read/write)	149928	149928	0	0.0
			.bss	147664	147664	0	0.0
			.data	2264	2264	0	0.0
			.text	951840	951840	0	0.0
		BRD4161A+rs911x	(read only)	791140	791140	0	0.0
			(read/write)	129512	129512	0	0.0
			.bss	127444	127444	0	0.0
			.data	2068	2068	0	0.0
			.text	791132	791132	0	0.0
	lock-app	BRD4161A+wf200	(read only)	947140	947140	0	0.0
			(read/write)	123996	123996	0	0.0
			.bss	121972	121972	0	0.0
			.data	2024	2024	0	0.0
			.text	947132	947132	0	0.0
	window-app	BRD4161A	(read only)	897796	897796	0	0.0
			(read/write)	133304	133304	0	0.0
			.bss	131256	131256	0	0.0
			.data	2048	2048	0	0.0
			.text	897788	897788	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	1000894	1001090	196	0.0
			(read/write)	1478218	1478250	32	0.0
			.dram0.bss	68208	68208	0	0.0
			.dram0.data	14624	14624	0	0.0
			.flash.rodata	209960	209992	32	0.0
			.flash.text	1000894	1001090	196	0.0
			.iram0.text	62954	62954	0	0.0
		m5stack	(read only)	1056019	1056203	184	0.0
			(read/write)	480212	480244	32	0.0
			.dram0.bss	73728	73728	0	0.0
			.dram0.data	34200	34200	0	0.0
			.flash.rodata	240288	240320	32	0.0
			.flash.text	1050635	1050819	184	0.0
			.iram0.text	123267	123267	0	0.0
k32w	light	k32w061+release	(read/write)	683032	683032	0	0.0
			.bss	80224	80224	0	0.0
			.data	2016	2016	0	0.0
			.text	599088	599088	0	0.0
	lock	k32w061+release	(read/write)	729608	729608	0	0.0
			.bss	80656	80656	0	0.0
			.data	1976	1976	0	0.0
			.text	645272	645272	0	0.0
linux	chip-tool-no-interactive-ipv6only	arm64	(read only)	9078228	9078228	0	0.0
			(read/write)	646209	646209	0	0.0
			.bss	42209	42209	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	583944	583944	0	0.0
			.dynamic	560	560	0	0.0
			.got	15016	15016	0	0.0
			.init	24	24	0	0.0
			.init_array	184	184	0	0.0
			.rodata	444948	444948	0	0.0
			.text	7169076	7169076	0	0.0
	thermostat-no-ble	arm64	(read only)	2353036	2353036	0	0.0
			(read/write)	176289	176289	0	0.0
			.bss	87585	87585	0	0.0
			.data	1520	1520	0	0.0
			.data.rel.ro	79376	79376	0	0.0
			.dynamic	560	560	0	0.0
			.got	4768	4768	0	0.0
			.init	24	24	0	0.0
			.init_array	376	376	0	0.0
			.rodata	147244	147244	0	0.0
			.text	1975808	1975808	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2420736	2420736	0	0.0
			.bss	202668	202668	0	0.0
			.data	5872	5872	0	0.0
			.text	1383380	1383380	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1181151	1181151	0	0.0
			bss	138380	138380	0	0.0
			rodata	153176	153176	0	0.0
			text	810720	810720	0	0.0
p6	all-clusters-app	default	(read/write)	2539096	2539096	0	0.0
			.bss	136176	136176	0	0.0
			.data	2808	2808	0	0.0
			.text	1497360	1497360	0	0.0
	light-app	default	(read/write)	2425512	2425512	0	0.0
			.bss	129488	129488	0	0.0
			.data	2608	2608	0	0.0
			.text	1383776	1383776	0	0.0
	lock-app	default	(read/write)	2436224	2436224	0	0.0
			.bss	129304	129304	0	0.0
			.data	2568	2568	0	0.0
			.text	1394488	1394488	0	0.0
telink	light-switch-app	tlsr9518adk80d	(read/write)	782752	782752	0	0.0
			bss	70608	70608	0	0.0
			noinit	40416	40416	0	0.0
			text	553478	553478	0	0.0
	lighting-app	tlsr9518adk80d	(read/write)	802844	802844	0	0.0
			bss	70864	70864	0	0.0
			noinit	40416	40416	0	0.0
			text	570244	570244	0	0.0

[msandstedt]

Note that session resumption on ESP32 is broken without this fix. Related to #16410.

CC @kghost