Tenants support in Java Admin SDK

[vkercan]

Support for user management based on a Tenant is currently not yet supported in Java Admin SDK, although Google Cloud Identity Platform already supports this (https://cloud.google.com/blog/products/identity-security/multi-tenancy-support-identity-platform-now-generally-available).

Would be helpful to extend this support also in Java Admin SDK.

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[hiranya911]

@micahstairs FYA

[micahstairs]

Thanks for the feature request! Fortunately, I've already begun working on this. We are still in the early stages (working out the design for the API), but once I begin working on the implementation, this issue will track my progress.