genericize `DataIdentity` for container types #8274

Job	Run time
check-pr	1s
lint / lint	18s
docs / Build linux64	1m 15s
package / Linux / Build linux64	4m 47s
package / Windows / Build win64	14m 6s
test / Windows MSVC / Build win64	12m 40s
test / Linux gcc-10 / Build linux64	3m 37s
test / Linux gcc-12 / Build linux64	5m 38s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	32s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	31s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	59s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	37s
	45m 1s

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