Option to not forward the resource parameter in the OAuth provider

[rschick]

Enhancement

Azure doesn't support the resource parameter in OAuth authorize requests, so the AzureProvider removes it.

We've run into the same issue when using Azure with Auth0. Could we make a similar change to the Auth0Provider, or maybe add a forward_resource: bool = true argument to the OAuthProxy class, similar to the forward_pkce argument, to allow servers to remove the resource parameter?

We're currently monkey patching Auth0Provider to remove the resource parameter similar to how it's done in the AzureProvider, so we have a workaround, but I feel the configuration option would be cleaner.