Tracking issues of OCaml binding

[Ranxy]

Ocaml is a very interesting language, and at the same time, we can use libraries like ocaml-rs to complete our bindings.

Tasks

• [x] Introducing a simple implement. #2757
• [x] Add documentation for OCaml code and build it.
• [x] Support more operations.
• [x] Creating and publishing opam package.
• [ ] Speed up the execution of CI, now setup-ocaml slows down the speed of CI.