build

Add `add_to_queue` to `Spirc` #229

Job	Run time
cargo +stable test (windows-latest)	3m 31s
cargo +1.85 test (ubuntu-latest)	2m 35s
cargo +stable test (ubuntu-latest)	1m 54s
cargo +1.85 test (windows-latest)	3m 43s
	11m 43s

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