feat: add support for probabilistic data structures

- Implemented Bloom filter commands: BF.RESERVE, BF.ADD, BF.MADD, BF.EXISTS, BF.MEXISTS, BF.INFO
- Implemented Cuckoo filter commands: CF.RESERVE, CF.ADD, CF.ADDNX, CF.EXISTS, CF.DEL, CF.COUNT, CF.INFO
- Implemented t-digest commands: TDIGEST.CREATE, TDIGEST.RESET, TDIGEST.ADD, TDIGEST.QUANTILE, TDIGEST.CDF, TDIGEST.MIN, TDIGEST.MAX, TDIGEST.INFO
- Implemented Top-K commands: TOPK.RESERVE, TOPK.ADD, TOPK.INCRBY, TOPK.QUERY, TOPK.COUNT, TOPK.LIST, TOPK.INFO
- Updated README.md to reflect new commands and features

Author: miserix13