Add octokit types for better DX

[cpreston321]

Describe the feature

Currently the data is any coming back from the fetch endpoint with types you can know what to expect from githubs side.

Additional information

• Would you be willing to help implement this feature?

[pi0]

Good point. But think github should not break the types and not worth the complexity to add types from another tool that gets propagation time if ever github changes something. (and it is internal)

[cpreston321]

I guess that makes since, I guess it's hard to figure out the data without looking at the response types since the version of the api is defined in the headers for using github REST API itself.

[pi0]

Yes. that's why i'm thinking ungh can provide a typed client. (maybe after unjs/ofetch#371)

let's track via #4