Add imports functionality #342

Job	Run time
Check WASM	39s
Test - stable toolchain	4m 20s
Docs - stable toolchain (recent)	1m 2s
Prepare	4s
Check Fuzz	49s
Test - MSRV	4m 12s
Test - nightly toolchain	4m 14s
Docs - nightly toolchain (recent)	1m 7s
Lint - nightly toolchain (recent)	49s
Format - nightly toolchain	17s
	17m 33s

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