fix: add types to indicate correct types path

[muli]

Please check if the PR fulfills these requirements

• It's the right issue type on the title
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• The commit message follows our guidelines
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• Docs have been added/updated (for bug fixes/features)
• It does not introduce a breaking change or has a description of the breaking change

Description

When setting up a brand new React project with TypeScript, I was getting this error:

Could not find a declaration file for module '@toast-ui/react-calendar'. '.../test-react-calendar/node_modules/@toast-ui/react-calendar/dist/toastui-react-calendar.mjs' implicitly has an 'any' type.
  There are types at '.../test-react-calendar/node_modules/@toast-ui/react-calendar/types/index.d.ts', but this result could not be resolved when respecting package.json "exports". The '@toast-ui/react-calendar' library may need to update its package.json or typings.ts(7016)

Which means that you have to include the path to the types file in package.json's export config.

---

Thank you for your contribution to TOAST UI product. 🎉 😘 ✨

[hungcrush]

Hi @adhrinae, when you have time, please check it.. It's very important when we using ts...

[kon14]

For anyone currently attempting to make of use of existing package releases, you could work around this via explicitly setting the types path in your tsconfig.json:

"compilerOptions": {
  "paths": {
    "@toast-ui/calendar": ["./node_modules/@toast-ui/calendar/types/index.d.ts"],
    "@toast-ui/react-calendar": ["./node_modules/@toast-ui/react-calendar/types/index.d.ts"],
    "@toast-ui/vue-calendar": ["./node_modules/@toast-ui/vue-calendar/types/index.d.ts"]
  }
}

edit: added React/Vue type paths