Add `FederatedProviderCredentials` class to Azos.Security/AuthKit/MinIdp to allow for FB/Twitter/any 3rd party OIDC federated login

[zhabis]

Related #587 See this:

Proposed design: the whole credential ned to be eqatable

FederatedProvderCredentials : IEQuatable<FederatedProviderCredentials>
{
  Atom               providerId
  JsonDataMap  data,
  getHashCode <-- to use as a key in dictionary lookup? 
}