Add a max length to cluster-objects typeinfo for string attributes.

[bzbarsky-apple]

This lets consumers size buffers based on the spec-defined max length.

Problem

Hard to know what buffer size to use for reading string attributes.

Change overview

Add the spec-defined max length to the metadata we output.

Testing

Code inspection of cluster-objects.h

[github-actions]

PR #14256: Size comparison from be9582b to 0acbb6c

Full report (20 builds for cyw30739, efr32, k32w, linux, mbed, p6, qpg, telink)

platform	target	config	section	be9582b	0acbb6c	change	% change
cyw30739	light	cyw930739m2evb_01	(read/write)	572258	572258	0	0.0
			.app_xip_area	477320	477320	0	0.0
			.bss	77684	77684	0	0.0
			.data	596	596	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
efr32	lighting-app	BRD4161A	(read only)	832688	832688	0	0.0
			(read/write)	127216	127216	0	0.0
			.bss	125312	125312	0	0.0
			.data	1900	1900	0	0.0
			.text	832680	832680	0	0.0
		BRD4161A+rpc	(read only)	820068	820068	0	0.0
			(read/write)	143872	143872	0	0.0
			.bss	141872	141872	0	0.0
			.data	2000	2000	0	0.0
			.text	820060	820060	0	0.0
	window-app	BRD4161A	(read only)	808864	808864	0	0.0
			(read/write)	125872	125872	0	0.0
			.bss	124016	124016	0	0.0
			.data	1856	1856	0	0.0
			.text	808856	808856	0	0.0
k32w	light	k32w061+release	(read/write)	660496	660496	0	0.0
			.bss	77456	77456	0	0.0
			.data	1868	1868	0	0.0
			.text	575372	575372	0	0.0
	lock	k32w061+release	(read/write)	661392	661392	0	0.0
			.bss	77720	77720	0	0.0
			.data	1892	1892	0	0.0
			.text	575980	575980	0	0.0
linux	chip-tool-ipv6only	arm64	(read only)	8697804	8697804	0	0.0
			(read/write)	390817	390817	0	0.0
			.bss	56017	56017	0	0.0
			.data	1128	1128	0	0.0
			.data.rel.ro	260888	260888	0	0.0
			.dynamic	560	560	0	0.0
			.got	69040	69040	0	0.0
			.init	24	24	0	0.0
			.init_array	200	200	0	0.0
			.rodata	532532	532532	0	0.0
			.text	7326532	7326532	0	0.0
	thermostat-no-ble	arm64	(read only)	2043436	2043436	0	0.0
			(read/write)	146625	146625	0	0.0
			.bss	65649	65649	0	0.0
			.data	904	904	0	0.0
			.data.rel.ro	73072	73072	0	0.0
			.dynamic	560	560	0	0.0
			.got	4048	4048	0	0.0
			.init	24	24	0	0.0
			.init_array	320	320	0	0.0
			.rodata	130620	130620	0	0.0
			.text	1698512	1698512	0	0.0
mbed	all-clusters-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2349912	2349912	0	0.0
			.bss	189404	189404	0	0.0
			.data	5296	5296	0	0.0
			.text	1312512	1312512	0	0.0
	lighting-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2332232	2332232	0	0.0
			.bss	180920	180920	0	0.0
			.data	5576	5576	0	0.0
			.text	1294832	1294832	0	0.0
	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2302816	2302816	0	0.0
			.bss	180824	180824	0	0.0
			.data	5568	5568	0	0.0
			.text	1265416	1265416	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)	2053896	2053896	0	0.0
			.bss	156876	156876	0	0.0
			.data	4864	4864	0	0.0
			.text	1016496	1016496	0	0.0
p6	all-clusters-app	default	(read/write)	2408048	2408048	0	0.0
			.bss	117748	117748	0	0.0
			.data	2584	2584	0	0.0
			.text	1366312	1366312	0	0.0
	light-app	default	(read/write)	2327768	2327768	0	0.0
			.bss	105512	105512	0	0.0
			.data	2408	2408	0	0.0
			.text	1286032	1286032	0	0.0
	lock-app	default	(read/write)	2297208	2297208	0	0.0
			.bss	105256	105256	0	0.0
			.data	2360	2360	0	0.0
			.text	1255472	1255472	0	0.0
qpg	lighting-app	qpg6105+debug	(read only)	565568	565568	0	0.0
			(read/write)	146936	146936	0	0.0
			.bss	89656	89656	0	0.0
			.data	1060	1060	0	0.0
			.text	560248	560248	0	0.0
	lock-app	qpg6105+debug	(read only)	514324	514324	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	89128	89128	0	0.0
			.data	992	992	0	0.0
			.text	509004	509004	0	0.0
	persistent-storage-app	qpg6105+debug	(read only)	107140	107140	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	38504	38504	0	0.0
			.data	288	288	0	0.0
			.text	101820	101820	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	839534	839534	0	0.0
			bss	87460	87460	0	0.0
			noinit	37160	37160	0	0.0
			text	586050	586050	0	0.0