Add support for additional client refresh_token fields

[Jeff]

https://auth0.com/docs/api/management/v2#!/Clients/post_clients

The api fields

infinite_token_lifetime
idle_token_lifetime
infinite_idle_token_lifetime

are not currently supported in the sdk.

[Alex Kalyvitis]

@woz5999 this one seems to be a duplicate of #184. Shall we close it?

[Jeff]

@alexkappa i'll close it. i must've double clicked or something and submitted the issue twice