Allow special characters in generated Lean 4 identifiers #7176

Job	Run time
Pyk: Code Quality & Unit Tests (3.10)	1m 30s
Java: Linting	1m 19s
Pyk: Code Quality & Unit Tests (3.11)	1m 25s
Pyk: Code Quality & Unit Tests (3.12)	1m 26s
Pyk: Code Quality & Unit Tests (3.13)	2m 5s
Code Quality Checks	1s
K: Ubuntu Jammy Package	22m 21s
K: Ubuntu Jammy Frontend Package	4m 17s
Pyk: Nix Build (ubuntu-24.04)	47s
K: Nix Build & Test (self-hosted, linux, normal)	5m 6s
Pyk: Nix Build (macos-14)	1m 34s
K: Source Build & Test	15m 11s
K: Nix Build & Test (MacM1, self-macos-12)	24m 40s
Pyk: Documentation	4m 45s
Pyk: Integration Tests	18m 39s
Pyk: Profiling	2m 44s
Pyk: Regression Tests	18m 19s
	2h 6m 9s

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