Experimental JSPI async option for `jco transpile` #1491

Job	Run time
ESLint	18s
WASI Test Generation	35s
Rustfmt	16s
Jco Build	1m 5s
Test Workspaces	19s
Jco Deno WASI Conformance Tests	0s
Jco Node.js WASI Conformance Tests	0s
Jco Test Suite	0s
	2m 33s

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