TuGraph-DB bindings

Low-level bindings to tugraph-db C API.

It is highly inspired by librocksdb-sys.

Version

The libtugraph-sys version number follows as librocksdb-sys which is in format X.Y.Z+TX.TY.TZ, where X.Y.Z is the version of this crate and follows SemVer conventions, while TX.TY.TZ is the version of the bundled tugraph-db.