Add thread module #1863

Job	Run time
msrv	2m 7s
clippy	2m 35s
nightly	5m 15s
docs	3m 23s
rustfmt	8s
basics	1s
build_feature (alloc)	3m 40s
no_std (ubuntu-latest, minimal)	1m 27s
build_feature (cli)	4m 10s
test_lib	5m 0s
no_std (macos-latest, minimal)	1m 37s
build_feature (cli,doc)	4m 12s
test_doc	6m 45s
build_feature (cli,fmt)	4m 18s
test_miri (rune)	3m 49s
build_feature (doc)	3m 45s
test_rune	3m 12s
test_miri (rune-core)	55s
wasm	1m 14s
build_feature (workspace)	3m 42s
test_miri (rune-alloc)	6m 4s
build_feature (languageserver)	3m 43s
build_feature (byte-code)	3m 52s
build_feature (capture-io)	3m 41s
build_feature (emit)	3m 30s
	1h 22m 5s

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