Add: Support wasm32-unknown-emscripten #3324

Job	Run time
features_check (ubuntu-latest)	5m 59s
check-docs	21s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	21s
cross-targets (x86_64-unknown-illumos)	1m 17s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	19s
cross-tests (ubuntu-latest)	2m 9s
alternative_targets (ubuntu-latest, aarch64-linux-android)	21s
rust_msrv (ubuntu-latest)	2m 15s
rust_versions (ubuntu-latest, stable)	1m 14s
no_std (ubuntu-latest, thumbv6m-none-eabi)	19s
test_wasi (ubuntu-latest, wasm32-wasi)	32s
rust_versions (ubuntu-latest, beta)	1m 21s
rust_versions (ubuntu-latest, nightly)	1m 17s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	18s
test_wasm (ubuntu-latest)	39s
timezones (ubuntu-latest, ACST-9:30)	1m 27s
timezones (ubuntu-latest, EST4)	1m 24s
timezones (ubuntu-latest, UTC0)	1m 26s
timezones (ubuntu-latest, Asia/Katmandu)	1m 26s
timezones (macos-latest, ACST-9:30)	1m 3s
timezones (macos-latest, EST4)	59s
timezones (macos-latest, UTC0)	1m 4s
timezones (macos-latest, Asia/Katmandu)	1m 56s
timezones (windows-latest, ACST-9:30)	2m 50s
timezones (windows-latest, EST4)	1m 45s
timezones (windows-latest, UTC0)	1m 45s
timezones (windows-latest, Asia/Katmandu)	1m 42s
	37m 29s

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