feat: add a `tket2.qsystem.utils` extension with `GetCurrentShot` #2626

Job	Run time
Check for changes	4s
Check Python code 🐍	1m 50s
tests (Rust nightly, coverage)	1m 56s
Build benchmarks 🏋️	4m 1s
Check Rust code 🦀	1m 25s
tests (Python, coverage)	1m 49s
tests (Rust 1.75)	1m 56s
tests (Rust stable, all features)	1m 30s
tests (Rust stable, no features)	1m 26s
tests (Rust beta)	1m 57s
Check standard extensions	34s
Required checks 🦀+🐍	1s
	18m 29s

Provide feedback