* add func: load_latest_options

* modify: retrun value

* modify: expose func

* modify: immutable borrow

* modify: remove warning

* modify: add assert

* modify: s/cf_dec/cf_desc, s/cf_decs/cf_descs

* modify: refactor

* modify: refactor

* modify: expose CColumnFamilyDescriptor

* modify: func name

* modify: cargo fmt the whole project

* fix: ci error