Run ts-node with esm loader

This fixes the issue where we are unable to run packages
that only export ES Modules. It's possible we will still run into some
issues with this configuration since ESM support is still experimental
on the TypeScript side.

Relevant issue: TypeStrong/ts-node#1007
ESM loader docs: https://typestrong.org/ts-node/docs/imports/#native-ecmascript-modules

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Monorepo for project bootstrapping CLIs",
   "main": "index.js",
+  "type": "module",
   "scripts": {
     "belt": "bin/belt",
     "test": "echo \"Error: no test specified\" && exit 1"

tsconfig.json

@@ -2,13 +2,17 @@
   "compilerOptions": {
     "allowSyntheticDefaultImports": true,
     "target": "es2019",
-    "module": "commonjs",
+    "module": "ES2020",
     "moduleResolution": "node",
     "strict": true,
     "sourceMap": true,
     "outDir": "./build",
     "skipLibCheck": true,
     "types": ["node"]
   },
+  "ts-node": {
+    "esm": true,
+    "experimentalSpecifierResolution": "node"
+  },
   "include": ["./**/*"]
 }