feat: add a `tket2.qsystem.utils` extension with `GetCurrentShot` #2639

Job	Run time
Check for changes	4s
Build benchmarks 🏋️	3m 58s
Check Rust code 🦀	1m 36s
tests (Rust nightly, coverage)	2m 12s
Check Python code 🐍	1m 53s
tests (Python, coverage)	1m 48s
tests (Rust 1.75)	2m 5s
tests (Rust stable, all features)	1m 26s
tests (Rust beta)	1m 51s
tests (Rust stable, no features)	1m 29s
Check standard extensions	59s
Required checks 🦀+🐍	1s
	19m 22s

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