Tests

feat: compute address for contract deployment #865

Job	Run time
no-std build	2m 44s
WASM tests	6m 21s
Unix tests (ubuntu-latest, stable)	5m 35s
Unix tests (ubuntu-latest, nightly)	3m 16s
Unix tests (macos-11, stable)	7m 41s
Unix tests (macos-11, nightly)	4m 54s
Windows tests (stable, x86_64-pc-windows-gnu)	9m 33s
Windows tests (stable, x86_64-pc-windows-msvc)	8m 53s
Windows tests (nightly, x86_64-pc-windows-gnu)	10m 30s
Windows tests (nightly, x86_64-pc-windows-msvc)	6m 47s
	1h 6m 14s

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