Add ability to set stack size for spawned threads #2174

Job	Run time
build_examples	3m 48s
Check	1m 4s
build_nightly	1m 31s
build_benchmarks	53s
Verify that web-sys is compiled correctly	48s
Clippy	6m 57s
dist_linux_aarch64_gnu	3m 12s
dist_linux_x86_64_musl	2m 38s
dist_macos_aarch64	1m 11s
dist_macos_x86_64	1m 11s
dist_windows	2m 56s
doc_api	1m 10s
doc_book	5s
Rustfmt	11s
Build and test the deno example	53s
Run js-sys crate tests	2m 19s
Run native tests	1m 47s
Run wasm-bindgen crate tests with multithreading enabled	3m 20s
Test TypeScript output of wasm-bindgen	1m 22s
Run UI compile-fail tests	42s
Run wasm-bindgen crate tests (unix)	4m 28s
Run web-sys crate tests	7m 28s
Run wasm-bindgen-webidl crate tests	2m 0s
test_examples	1m 55s
deploy	33s
	54m 22s

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