prepare 3.3.0

[aeschli]

Also adds exports section to package.json
Closes #78
Closes #56

[jakebailey]

Unfortunately, this change wasn't right: #78 (comment)

I would also suggest running attw and publint as they both catch the problems:

• https://arethetypeswrong.github.io/?p=jsonc-parser%403.3.0
• https://publint.dev/jsonc-parser@3.3.0

[remcohaszing]

I like to use bare imports in tests, so the tests would import 'jsonc-parser'. That, in combination with running tests in both CJS and ESM like #78 does, also ensures package exports work correctly.