Add ReScript suggested extension for res and resi files

[KidkArolis]

Release Notes:

• Added ReScript as a suggested extension for .res and .resi files

~~Release Notes:~~

~~- Added ReScript file icon and a suggested extension for .res and .resi files~~

~~Totally understand if you're not merging these into the core anymore with the expanding zed_extension_api - in that case, sorry for the noise, happy to swiftly close this PR!~~

[KidkArolis]

Force pushed to keep the suggested extension only.