build

Add `add_to_queue` to `Spirc` #226

Job	Run time
cargo +stable test (windows-latest)	3m 38s
cargo +1.85 test (windows-latest)	4m 7s
cargo +stable test (ubuntu-latest)	2m 7s
cargo +1.85 test (ubuntu-latest)	2m 24s
	12m 16s

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