Improve CI for wasmer_wamr feature #698

Job	Run time
bench-windows (wasmer_sys)	5m 41s
bench-windows (wasmer_wamr)	4m 32s
test-windows (wasmer_sys)	5m 28s
test (test, ubuntu-latest, wasmer_sys)	4m 7s
test-windows (wasmer_wamr)	2m 35s
test (test, ubuntu-latest, wasmer_wamr)	58s
test (test, macos-latest, wasmer_sys)	4m 18s
test (test, macos-latest, wasmer_wamr)	1m 50s
test (bench, ubuntu-latest, wasmer_sys)	6m 0s
test (bench, ubuntu-latest, wasmer_wamr)	6m 16s
test (bench, macos-latest, wasmer_sys)	5m 56s
test (bench, macos-latest, wasmer_wamr)	5m 57s
	53m 38s

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