Improve CI for wasmer_wamr feature #696

Job	Run time
test-windows (wasmer_sys)	5m 21s
test-windows (wasmer_wamr)	3m 1s
bench-windows (wasmer_sys)	5m 59s
test (test, ubuntu-latest, wasmer_sys)	3m 44s
bench-windows (wasmer_wamr)	4m 57s
test (test, ubuntu-latest, wasmer_wamr)	5m 57s
test (test, macos-latest, wasmer_sys)	1s
test (test, macos-latest, wasmer_wamr)	1s
test (bench, ubuntu-latest, wasmer_sys)	6m 14s
test (bench, ubuntu-latest, wasmer_wamr)	6m 16s
test (bench, macos-latest, wasmer_sys)	3m 8s
test (bench, macos-latest, wasmer_wamr)	4m 39s
	49m 18s

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