Port OCaml bindings to use Dune and Opam

[XVilka]

Your checklist for this pull request

• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

• Switch to use what most modern OCaml projects use - Dune build system: https://dune.build/

• Provide an opam package

• Based on bindings/ocaml: fix ARM64 -> AArch64 #2318

Test plan

• CI is green
• opam install .
• dune test

Closing issues

Closes #985

[XVilka]

There is still missing proper testing, I think I will just write a proper tests, that will compare the output with the expected, and will add the testing step to the CI.

[Rot127]

There is still missing proper testing, I think I will just write a proper tests, that will compare the output with the expected, and will add the testing step to the CI.

Yes, for now this is enough. But at minimum the build should added in the CI.

[strub]

Hi. Against which version of capstone this binding should be compiled? The OCaml stub does not seem in sync with the Capstone API as found in the branch the OCaml stub belongs to.

[strub]

The bindings build correctly with Capstone 5.0.1.

[XVilka]

Hi, it's still in progress. I am targeting 6.0. I still need to implement missing architectures support that were added since the last time OCaml bindings were touched. I also plan to add proper testing with alcotest. Moreover, the auto-sync scripts should be extended to auto-regenerate constants so that they are in sync with the C version. Once everything is done, I also plan to package it for opam and send PR to the opam-repository.