fix(cddl2ts): infer template literal types from regexp strings

[christian-bromann]

Summary

• normalize cddl operator handling so native text types with .regexp are preserved without misclassifying reference operators
• generalize cddl2ts regexp inference so string regexes containing one or more literal .+ wildcards become template literal types (for example custom:.+, foo_.+, some_.+_name, and multi-slot variants)
• keep non-template-friendly regexes as plain string/str fallbacks
• mirror the same generalized behavior in cddl2py with Python-friendly Annotated[...] metadata, plus StringConstraints in Pydantic mode
• add focused parser, utils, and generator coverage for the generalized regexp case

Testing

• pnpm run compile
• pnpm run test:typechecks
• pnpm exec vitest --config vitest.config.ts --run --coverage.enabled=false packages/cddl/tests/parser.test.ts packages/cddl/tests/utils.test.ts packages/cddl2ts/tests/transform_edge_cases.test.ts packages/cddl2py/tests/transform_edge_cases.test.ts

[linux-foundation-easycla]

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• ✅ login: christian-bromann / name: Christian Bromann (094128f, 224da17, 62d797b, f278e6e)