feat: Scoping rules and utilities for symbols, links and variables #2854

Job	Run time
Check for changes	4s
tests (Rust nightly, coverage)	3m 56s
Build benchmarks 🏋️	1m 58s
tests (Rust 1.75)	2m 28s
check	38s
tests (Rust beta)	2m 53s
tests (Rust stable, all features)	2m 35s
tests hugr-llvm	0s
tests (Rust stable, no features)	1m 50s
Check standard extensions	5s
Required checks 🦀	1s
	16m 28s

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