threads: add spectests for Wasm threads proposal #3309

Job	Run time
Build TinyGo test binary	8s
Build Zig test binary	4s
Go-1.21 (Ubuntu, amd64, baseline)	3m 4s
Go (js) (ubuntu-22.04)	22s
Go (js) (macos-12)	52s
Go-1.21 (macOS, amd64, baseline)	5m 43s
Go-1.21 (Windows, amd64, baseline)	4m 23s
wasi-testsuite (ubuntu-22.04)	19s
Go-1.21 (Ubuntu, arm64, optimizing)	21m 23s
wasi-testsuite (macos-12)	41s
wasi-testsuite (windows-2022)	1m 45s
Zig (Ubuntu, amd64, baseline)	4m 2s
Zig (macOS, amd64, baseline)	5m 9s
Zig (Windows, amd64, baseline)	7m 11s
Zig (Ubuntu, arm64, optimizing)	9m 4s
TinyGo (Ubuntu, amd64, baseline)	31s
TinyGo (macOS, amd64, baseline)	47s
TinyGo (Windows, amd64, baseline)	1m 42s
TinyGo (Ubuntu, arm64, optimizing)	5m 16s
	1h 12m 26s

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