Remove use of Vector

[giltho]

Using Vector is not required anymore since Dynarray was added to Stdlib in OCaml 5.2.0

That being said, I understand that this means Progress is only compatible with 5.2 and beyond, so I'm not convinced it's a good idea to merge this.
I made it because lem exposes a Vector module and that clashes with the Vector library... And modifying lem is a much harder task than modifying Progress. I did ask the maintainers of lem to hide the export to avoid that issue, but in the meantime I have my fork of Progress.

Still, I thought I'd open the PR and let you make that decision :)

[giltho]

(That being said, going to OCaml 5 would give a good occasion to address #46 and to give an effect-handler interface to Progress, it's a perfect use case, instead of having to carry around the progress function)

[dinosaure]

In my opinion, forcing progress to require only OCaml 5.2 is too restrictive for people who use progress and want this library to remain available for 4.14 (at least).

I made it because lem exposes a Vector module and that clashes with the Vector library... And modifying lem is a much harder task than modifying Progress. I did ask the maintainers of lem to hide the export to avoid that issue, but in the meantime I have my fork of Progress.

Another solution could be to rename the Vector module to progress - this module is not intended to be exported.

[giltho]

I think the issue stems from the existence of Vector in my opam switch as a dependency of something I import, I don't think it's exported by Progress at all.

But yeah, I agree that it's a bit restrictive.