Myeongseon Choi 4075d2ef69 Add new problem modules prob800 and prob853, and update dependencies ...

- Introduced the `prob800` module, implementing a function to count hybrid integers with corresponding unit tests.
- Added the `prob853` module, which includes functions for calculating Pisano periods and their factors, along with extensive unit tests.
- Updated `mod.rs` to include the new problem modules.
- Added the `indicatif` dependency to `Cargo.toml` for progress indication in long-running tasks.
- Enhanced the `factor` utility with a new function to derive divisors from prime factorization.

2025-09-21 00:05:04 +09:00

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