Declare package type and export "default"

[kraenhansen]

The package.json of the @callstack/polygen package use types or require as exports condition for all its exports, it should either dual-publish ESM files or use default instead of require:

polygen/packages/polygen/package.json

Lines 10 to 24 in 0d0a255

	"exports": {
	".": {
	"types": "./dist/index.d.ts",
	"require": "./dist/index.js"
	},
	"./polyfill": {
	"types": "./dist/polyfill.d.ts",
	"require": "./dist/polyfill.js"
	},
	"./config": {
	"types": "./dist/config.d.ts",
	"require": "./dist/config.js"
	},
	"./package.json": "./package.json"
	},

With the current situation, the latest version of Expo (SDK 53) and Metro (0.82.4) fails to import the polyfill:

iOS Bundling failed 271ms example/index.ts (549 modules)
Unable to resolve "@callstack/polygen/polyfill" from "example/App.tsx"

I suggest declaring the package "type": "commonjs" too.