Needed OMP changes

[aantron]

esy.json is mainly for installation inside NPM, to tie the OCaml version to the OCaml BuckleScript version (4.06), so that the ASTs are compatible. For standalone esy usage, we should undo this.

There are three main ways:

1. Detect that we are running inside NPM, as opposed to being installed directly for another esy package, and run a configure script to determine the BuckleScript version and the corresponding OCaml version. I don't think this can work, because BuckleScript is a peer dependency, and NPM installs it after Bisect_ppx. It is fragile anyway.
2. Generalize OMP so that the built PPX can read any version of AST. Ability to read any version of AST ocaml-ppx/ocaml-migrate-parsetree#78
3. Distribute prebuilt binaries, and select the right one dynamically.

• --dump-ast: write the same version of AST that was read ocaml-ppx/ocaml-migrate-parsetree#79
• Infer file kind for binary ASTs ocaml-ppx/ocaml-migrate-parsetree#80
• --dump-ast: preserve binary AST version ocaml-ppx/ocaml-migrate-parsetree#81
• Add ?argv argument to Driver.run_main ocaml-ppx/ocaml-migrate-parsetree#82
• Fix parse_argv usage ocaml-ppx/ocaml-migrate-parsetree#83
• Allow not exiting on error, and parse command line from the first argument ocaml-ppx/ocaml-migrate-parsetree#84
• Adapt this repo.
• Wait for an OMP release and remove the resolution from esy.json.

[aantron]

Addressed by ocaml-migrate-parsetree 1.6.0 and 395dbbf.