add symbol lookup functions for dfsdl and dfimg #9290

Job	Run time
check-pr	1s
lint / lint	15s
docs / Build linux64	1m 4s
package / Linux / Build linux64	6m 35s
package / Windows / Build win64	20m 54s
test / Windows MSVC / Build win64	18m 47s
test / Linux gcc-10 / Build linux64	5m 41s
test / Linux gcc-12 / Build linux64	8m 26s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	55s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	58s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 7s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 17s
	1h 6m 0s

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