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gh-147991: Speed up tomllib import time (GH-147992)

- Use lazy import for regular expressions.
- Use frozendict for string escapes

Co-authored-by: Taneli Hukkinen <hukkinen@eurecom.fr>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
V
Victor Stinner committed
a60520da3cb0c571a361b9d0b8d998e78f38b836
Parent: bf42481
Committed by GitHub <noreply@github.com> on 4/30/2026, 4:25:32 PM