Add `.ocamlformat` Configurations

type:internal

Related issue: #1442 (closed)

This MR adds the .ocamlformat files to the compiler as per the discussion from slack.

Currently, there is a root .ocamlformat file in /src which dictates the formatting the entire compiler. The current configuration is:

profile=janestreet
let-binding-spacing=sparse
margin=80

which was set by precedent (!1905 (merged), !2000 (merged)). This configuration can (and probably will) be changed in the future.

Various passes can disable formatting (e.g. passes 00-02 and 14-18) by using the following .ocamlformat configuration:

disable=true

No formatting is performed in this MR to avoid interfering with currently open/WIP MRs.

Changelog details: Add .ocamlformat configs to the compiler