Implemented CustomUserClaims

[dominikfoldi]

I have implemented the Custom User Claims feature. I do not checked out the contributing guidelines yet but I want to get feedback from you about my changes. I will implement the tests after everything else looks good.

My main guideline was the Java SDK.

@hiranya911 could you please check this out?

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[hiranya911]

Thanks for doing this @dominikfoldi. I think you have all the basic elements. The details need a bit of polishing.

[googlebot]

CLAs look good, thanks!

[hiranya911]

Thanks @dominikfoldi. This is looking pretty good. I've pointed out few changes. While you're working on them. I'm going to start our internal API review process for this, so we can get it merged and released soon.

[dominikfoldi]

@hiranya911 I think I am resolved all your requests. Thanks to you I found a bug in the FirebaseUserManager's PostAsync method when the server responds with empty uid, I don't know if could ever happen but I covered that just in case.

[hiranya911]

Just 2 more comments. I also have submitted this API for internal review. I should hear back in a couple of days. Hopefully we can get this released next week.

[hiranya911]

LGTM. Waiting API review approval for merge.

[dominikfoldi]

Thank you for this super fast process! Looking forward to it!

[hiranya911]

@dominikfoldi this is released: https://firebase.google.com/support/release-notes/admin/dotnet#1.1.0

Hope you continue to contribute.

[dominikfoldi]

@hiranya911 thank you for the release!

Our next step is to integrate Firebase Authentication into our project. But after I am sure that I will contribute more!