build

Add `add_to_queue` to `Spirc` (#1676) #237

Job	Run time
cargo +stable test (ubuntu-latest)	2m 3s
cargo +stable test (windows-latest)	3m 34s
cargo +1.85 test (windows-latest)	3m 44s
cargo +1.85 test (ubuntu-latest)	2m 30s
	11m 51s

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