build

Add `add_to_queue` to `Spirc` #235

Job	Run time
cargo +stable test (windows-latest)	3m 30s
cargo +1.85 test (ubuntu-latest)	2m 28s
cargo +stable test (ubuntu-latest)	1m 55s
cargo +1.85 test (windows-latest)	4m 4s
	11m 57s

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