fix(firebase_auth): added supporting rawNonce for OAuth credential on Windows platform

[JekaNS]

Description

Added support for the rawNonce field in credential builder on the Windows platform.

Since there is no implementation of AppleAuthProvider on Windows platform, I am trying to use OAuthProvider. This works on MacOS, but on Windows I couldn't pass an idToken with a rawNonce and no accessToken to the credential builder. And signInWithCredentials threw an exception.

With this PR if rawNonce is provided then will be used overloaded credential builder firebase::auth::OAuthProvider::GetCredential that accept rawNonce argument.

Example of use:

    final credential = OAuthProvider("apple.com").credential(idToken: webAuthRes.idToken, rawNonce: webAuthRes.nonce);
    FirebaseAuth.instance.signInWithCredential(credential);

Related Issues

No existing issues found ((

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[Lyokone]

Hello @JekaNS thanks a lot for this feature, it looks great. I'll do a couple of manual tests first but it should be fine

[Lyokone]

Can you just check the formatting of the files?

[JekaNS]

Hi @Lyokone,
Sure. Formating fixed.

[Lyokone]

Thanks for the contribution!