build

Add `add_to_queue` to `Spirc` #236

Job	Run time
cargo +1.85 test (ubuntu-latest)	2m 49s
cargo +stable test (windows-latest)	4m 25s
cargo +1.85 test (windows-latest)	4m 14s
cargo +stable test (ubuntu-latest)	1m 54s
	13m 22s

Provide feedback