Implement calculation of AssetId and genesis blocks #703

Job	Run time
Test 32-bit version	1m 0s
Docs - stable toolchain	1m 32s
Test - stable toolchain (recent)	6m 7s
Test - msrv toolchain (recent)	1m 24s
Test - nightly toolchain (recent)	6m 6s
Lint - nightly toolchain	1m 29s
Check WASM	44s
Cross test	1m 39s
Docs - nightly toolchain	1m 52s
Bench - nightly toolchain	1m 31s
	23m 24s

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