ci: Continuous benchmarking with codspeed.io #2679

Job	Run time
Check for changes	2s
Continuous benchmarking 🏋️	3m 32s
Check Rust code 🦀	1m 38s
Check Python code 🐍	1m 49s
tests (Rust nightly, coverage)	2m 14s
tests (Python, coverage)	1m 50s
tests (Rust 1.75)	2m 9s
tests (Rust beta)	1m 55s
tests (Rust stable, all features)	1m 40s
tests (Rust stable, no features)	1m 50s
Check standard extensions	1m 9s
Required checks 🦀+🐍	1s
	19m 49s

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