chore: release krep v0.1.1 with performance and bug fixes

- Improved pattern matching efficiency with non-overlapping search optimizations
- Fixed edge cases in `kmp_search`, `rabin_karp_search`, `simd_search`, and `avx2_search`
- Optimized single-character searches and case-insensitive SIMD/AVX2 handling
- Addressed memory safety and improved code maintainability

Author: davidesantangelo