Support package.json "exports" when resolving tstl.luaPlugins #1731

luaPlugins tstl option with name field currently cannot resolve plugin packages that rely on package.json "exports" subpath mappings.

Example tsconfig:

{
  "tstl": {
    "luaPlugins": [
      {
        "name": "my-package/plugins"
      }
    ]
  }
}

This fails with a plugin resolution diagnostic like:

Could not resolve "my-package/plugins" plugin from "...".

However, the package is valid and works with Node resolution:

require("my-package/plugins")

I doubt because resolve library that currently tstl is using is old and unable to resolve the plugin package via package.json's "exports" properly

https://github.com/TypeScriptToLua/TypeScriptToLua/blob/master/src/transpilation/utils.ts#L54

resolved = resolve.sync(query, { basedir, extensions: [".js", ".ts", ".tsx"] });