build

Add `add_to_queue` to `Spirc` #230

Job	Run time
cargo +1.85 test (ubuntu-latest)	2m 16s
cargo +1.85 test (windows-latest)	3m 25s
cargo +stable test (ubuntu-latest)	2m 6s
cargo +stable test (windows-latest)	3m 37s
	11m 24s

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