Add WASI support for server-side rendering. #2387

Job	Run time
Documentation Tests	48s
Example Runnable Tests on WASI (wasi_ssr_module, 1.64.0)	35s
Integration Tests on 1.64.0	4m 31s
Example Runnable Tests on WASI (wasi_ssr_module, stable)	33s
Integration Tests on stable	2m 49s
Example Runnable Tests on WASI (wasi_ssr_module, nightly)	25s
spellcheck	17s
Test lints on nightly	25s
Unit Tests on 1.64.0	1m 32s
Unit Tests on stable	59s
Unit Tests (WASI) on 1.64.0	32s
Unit Tests (WASI) on stable	28s
Unit Tests on nightly	45s
Unit Tests (WASI) on nightly	37s
	15m 16s

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