fix: change isSuccessResponse to a type predicate

[antklim]

Description

This PR updates isSuccessResponse method to a type predicate.

This change makes code consistent with isCancelledResponse.

This enables better user experience with type system.

Before

import { GoogleSignin, isSuccessResponse } from '@react-native-google-signin/google-signin'

const response = await GoogleSignin.signIn()

if (isSuccessResponse(response)) {
  // response type is SignInResponse, response.data type is User | null
}

After

import { GoogleSignin, isSuccessResponse } from '@react-native-google-signin/google-signin'

const response = await GoogleSignin.signIn()

if (isSuccessResponse(response)) {
  // response type is SignInSuccessResponse, response.data type is User
}

[vonovak]

Thank you! This is how it was intended to be 👍

[github-actions]

🎉 This PR is included in version 13.0.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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