feat: Scoping rules and utilities for symbols, links and variables #2867

Job	Run time
Check for changes	6s
tests (Rust nightly, coverage)	3m 40s
Build benchmarks 🏋️	1m 57s
check	1m 29s
tests (Rust 1.75)	2m 13s
tests (Rust beta)	2m 5s
tests (Rust stable, all features)	2m 37s
tests hugr-llvm	0s
tests (Rust stable, no features)	1m 9s
Check standard extensions	13s
Required checks 🦀	1s
	15m 30s

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