Better ocamlformat-rpc intergration

[ulugbekna]

Currently, we format code in the hover, we should also be able to

• format source code (currently, we call ocamlformat binary to format source files, which can be avoided if ocamlformat-rpc is installed)
• format generated code:
  • destructed code
  • generated intf code

Other suggestions?

[rgrinberg]

What about replacing using ocamlformat-rpc for user format queries when it's available? Currently we still run the binary ocamlformat binary on every request.

[panglesd]

I opened PR #549 to fix this issue :)

[rgrinberg]

@panglesd I assigned this ticket to you.

[rgrinberg]

@panglesd is formatting generated code possible yet?

[panglesd]

Yes, formatting destructed code and generated interface is working when #599 is merged.