feat: add a `tket2.qsystem.utils` extension with `GetCurrentShot` #2637

Job	Run time
Check for changes	7s
Check Python code 🐍	1m 47s
Build benchmarks 🏋️	4m 13s
tests (Rust nightly, coverage)	2m 0s
Check Rust code 🦀	1m 20s
tests (Python, coverage)	2m 0s
tests (Rust 1.75)	2m 0s
tests (Rust stable, all features)	1m 43s
tests (Rust beta)	2m 18s
tests (Rust stable, no features)	1m 26s
Check standard extensions	1m 19s
Required checks 🦀+🐍	1s
	20m 14s

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