Add pagination and tests for Client Grants

[joshcanhelp]

• Add page and per_page parameters to Auth0::Api::V2::ClientGrants::client_grants endpoint
• Add unit and integration tests for this change
• Remove sleep directives from the client grant integration tests

[machuga]

You may want to simplify this down to page.nil? || per_page.nil? ? nil : per_page.to_i. There are a lot of symbols going on already, so reducing the cognitive overhead of negated ANDs should help reduce the complexity.

I'll also add that if anyone drops in a boolean to these params, the method will raise since to_i is not implemented on booleans. I'm assuming this logic exists just to cast strings to ints though. And some of the logic seems confusing to read through. Here is a potential alternative to the method that I'm not sure I like any better, but 🤷‍♂️.

def client_grants(page: nil, per_page: nil)
  return get(client_grants_path) if page.nil?

  clean_per_page = per_page.nil? ? nil : per_page.to_i

  get(client_grants_path, page: page.to_i, per_page: clean_per_page) 
end

It explicitly shows that if page is nil we have nothing to do here, then continues on with the logic.

Ideally you could get rid of the last ternary if the logic of passing per_page supports it, but that's something you'd have to check out.

[joshcanhelp]

Good feedback, thank you. I'll see if I can simplify this a little better in a new commit.

[joshcanhelp]

@machuga - Removed casting here since it was not doing anything (string values passed were still returning the correct results)

[machuga]

LGTM!