Allow special characters in generated Lean 4 identifiers #7177

Job	Run time
Java: Linting	1m 18s
Pyk: Code Quality & Unit Tests (3.10)	1m 31s
Pyk: Code Quality & Unit Tests (3.11)	1m 18s
Pyk: Code Quality & Unit Tests (3.12)	1m 21s
Pyk: Code Quality & Unit Tests (3.13)	2m 6s
Code Quality Checks	1s
K: Ubuntu Jammy Frontend Package	3m 40s
Pyk: Nix Build (ubuntu-24.04)	48s
K: Source Build & Test	3m 39s
Pyk: Nix Build (macos-14)	1m 31s
K: Nix Build & Test (self-hosted, linux, normal)	3m 43s
K: Ubuntu Jammy Package	3m 42s
K: Nix Build & Test (MacM1, self-macos-12)	3m 40s
Pyk: Documentation	1s
Pyk: Regression Tests	1s
Pyk: Profiling	1s
Pyk: Integration Tests	1s
	28m 22s

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