jedib0t / go-passwords / 20737517754

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add rng package with crypto/rand and comprehensive tests (#6)

- add new rng package using crypto/rand for cryptographic security
- implement IntN with rejection sampling to avoid modulo bias
- implement Shuffle using Fisher-Yates algorithm
- add comprehensive unit tests covering edge cases and range coverage
- add benchmark tests for performance measurement
- update password and passphrase generators to use new rng package
- remove SetSeed method as crypto/rand doesn't use seeds
- fix WithoutDuplicates to use map for O(n) performance
- fix error message formatting to use fmt.Errorf
- optimize passphrase word selection with map-based tracking
- optimize ambiguous character lookup with map instead of string search

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