fix: Supports coexistence of multiple snappy versions

Walkthrough

此次更改引入了对LevelDB构建过程的新配置选项，特别是支持Snappy压缩库。这些修改确保Snappy库在构建LevelDB之前正确定位和链接，增强了构建管理和依赖关系处理，可能改善LevelDB的性能。

Changes

文件	更改摘要
cmake/braft.cmake, cmake/leveldb.cmake	新增Snappy支持，添加了`-DLEVELDB_WITH_SNAPPY=ON`标志，并配置了Snappy库的查找和依赖关系管理。

Poem

在草丛间，轻轻跳，
兔子迎来新相好。
Snappy压缩如春风，
LevelDB更胜从前梦。
快乐构建无烦恼，
数据飞扬任遨游！ 🐇✨

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OpenAtomFoundation / pikiwidb