add rescript support to vim-polyglot

[mudrz]

https://github.com/sheerun/vim-polyglot is a popular repo for getting all languages support (so that you don't install each lsp individually)

should this be added to the list to make it simpler for newcomers to have rescript syntax support out of the box, without even installing any new plugins

for example reason config:
https://github.com/sheerun/vim-polyglot/blob/ce31cd1d2f4e8eee9fd91325e4599f15cb9566fd/packages.yaml#L1390-L1394

and ocaml:
https://github.com/sheerun/vim-polyglot/blob/ce31cd1d2f4e8eee9fd91325e4599f15cb9566fd/packages.yaml#L1105-L1117

[amiralies]

this repo does more than just syntax highlighting (intellisense stuff and others) if it's okay for them to increase the installation size you can send a pr for them.