Add ignore_thread_creation to PrefixFrameworkOptions (#211) #883

Job	Run time
Clippy	1m 22s
Test (MSRV)	6m 29s
Build docs	3m 50s
Test (stable)	3m 41s
Rustfmt	14s
Test (beta)	3m 14s
Test (nightly)	3m 14s
Test (macOS)	4m 18s
Test (Windows)	7m 26s
Test (no features)	1m 50s
Test (all features - simdjson, cargo test --all-features --lib --tests --examples)	1m 53s
Test (native TLS, cargo test --all-features --features serenity/native_tls_backend --lib --tests ...	2m 15s
	39m 46s

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