Add MFA Authentication policies to GuardianEntity

[pelletier197]

Changes

I added the endpoints for that were missing. This is kind of required to enable the MFA for your application.

• Getting MFA policies. https://auth0.com/docs/api/management/v2#!/Guardian/get_policies
• Update MFA policies https://auth0.com/docs/api/management/v2#!/Guardian/put_policies

Testing

AuthAPI auth = new AuthAPI("<>", "<>", "<>");
ManagementAPI api = new ManagementAPI("<>", auth.requestToken("<>").execute().getAccessToken());

System.out.println(api.guardian().getAuthenticationPolicies().execute());
System.out.println(api.guardian().updateAuthenticationPolicies(Arrays.asList("all-applications")).execute());
System.out.println(api.guardian().getAuthenticationPolicies().execute());
System.out.println(api.guardian().updateAuthenticationPolicies(Arrays.asList()).execute());
System.out.println(api.guardian().getAuthenticationPolicies().execute());

outputs

[]
[all-applications]
[all-applications]
[]
[]

Putting the value to all-applications produces the following

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[lbalmaceda]

Looks good, thanks! I'll leave the doc change for a later PR.

[lbalmaceda]

missing parameter annotation