Implement OneTapSignInWithGoogleButton

[shubhamsinghshubham777]

This PR implements an even easier way for the end users to consume this library by introducing a One Tap Google Sign In button based on Google's official sign-in button design guidelines.

There are 3 theme variants:

1. Light
2. Dark
3. Neutral

The button uses default values for all params except the clientId which makes it very easy for the end user to get started with our button while providing him with a more authentic Sign-in experience.

For example, getting started with this button is as easy as writing just this:

@Composable
fun AuthScreen() {
    OneTapSignInWithGoogleButton(
        clientId = "YOUR_CLIENT_ID"
    )
}

No need to write OneTapSignInWithGoogle and manage its state anymore if you don't want to.

Previews

Please note that these Compose previews won't work properly (i.e. be shown in the preview window) until #16 is merged

[shubhamsinghshubham777]

@stevdza-san Could you please have a look at this?

[stevdza-san]

Thanks for the PR, I'll take a look at it in the next week and decide if I would proceed with it. 😊

[shubhamsinghshubham777]

@stevdza-san Did you get a chance to have a look at both PRs?

[stevdza-san]

Great updates @shubhamsinghshubham777 👍 In the new release I'll just update the tag to be the same on both sides, so that we can have a consistence.

[shubhamsinghshubham777]

Great updates @shubhamsinghshubham777 👍 In the new release I'll just update the tag to be the same on both sides, so that we can have a consistence.

That's awesome! Thank you @stevdza-san 👏

[shubhamsinghshubham777]

Do you need a hand with the README as well? I'd be happy to contribute.

[stevdza-san]

@shubhamsinghshubham777 Sure, feel free to add an additional section for the Google button.