Add WASI support for server-side rendering. #2529

Job	Run time
Documentation Tests	2m 59s
Integration Tests on 1.76.0	2m 39s
Integration Tests on stable	2m 46s
spellcheck	8s
Unit Tests on 1.76.0	2m 4s
Unit Tests on stable	1m 4s
Unit Tests on nightly	1m 46s
Example Runnable Tests on WASI (wasi_ssr_module, 1.76.0)	36s
Example Runnable Tests on WASI (wasi_ssr_module, stable)	34s
Example Runnable Tests on WASI (wasi_ssr_module, nightly)	50s
Test lints on nightly	1m 26s
Unit Tests (WASI) on 1.76.0	42s
Unit Tests (WASI) on stable	49s
Unit Tests (WASI) on nightly	1m 2s
	19m 25s

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