feat(bindings/ocaml): add more blocking api for ocaml

[asukaminato0721]

Which issue does this PR close?

part of #2756.

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

[asukaminato0721]

here are the publish steps.

1. Install required tools:

opam install dune-release

2. Set up opam-repository fork:

# Fork https://github.com/ocaml/opam-repository on GitHub
git clone https://github.com/YOUR_USERNAME/opam-repository.git

Publishing Process

1. Prepare the release:

cd bindings/ocaml
./release.sh 0.48.0  # Replace with your version

2. Test locally:

# Test installation from the local directory
opam install . --deps-only
opam install .

# Test that it works
ocaml -I $(opam var lib)/opendal -c "open Opendal.Operator"

3. Submit to opam-repository:

dune-release publish distrib --verbose

[asukaminato0721]

cc @Ranxy

[Xuanwo]

Thank you @asukaminato0721 for your work on this. Most of the API changes for OCaml look good to me. My only concern is that it would be better to move the release part into a separate PR.

[Xuanwo]

Nice, I love this.

[Xuanwo]

Let's go!