[Types] Update ICookie interface to use generics

[randompch]

🔍 Context

Fixes #160

🏗 Work

• Update packages/cookie-universal/types/index.d.ts

🗒 Notes

1. It's actually been implemented in the nuxt module in 2020 : b97b792

2. Also, what about overloading the getAll() function ? It would add type safety without breaking changes. 🤔

export interface ICookie {
  // [...]

  getAll(opts: ICookieGetOpts & { parseJSON: false }): Record<string, string>
  getAll(opts: ICookieGetOpts & { parseJSON: true }): Record<string, any>
  getAll<T = Record<string, any>>(opts?: ICookieGetOpts): T

  // [...]
}

Potential usage :

// Should infer Record<string, string>
const strings = cookies.getAll({ parseJSON: false });

// Should infer Record<string, any>
const parsed = cookies.getAll({ parseJSON: true });

// Should allow generic override
const typed = cookies.getAll<SomeCustomType>();

// Should work without options (backward compatible)
const all = cookies.getAll();

The same could be done to the get() function.

I can move this proposal to a dedicated issue if we need to discuss it.
I also can drop it completely 💪

Cheers

[randompch]

Ping @microcipcip 🫶