Enable bound CIDRs for LDAP and Kerberos groups and users

[nmasur]

Is your feature request related to a problem? Please describe.

Bound CIDRs can be defined for entities, groups, and backend roles, but this same security feature cannot be defined for LDAP or Kerberos groups and/or users. It doesn't seem to me like this limitation should be there.

Describe the solution you'd like

Enable the "common token arguments" used in backend roles for LDAP: token_ttl, token_max_ttl, token_period, token_policies, token_bound_cidrs, token_explicit_max_ttl, token_no_default_policy, token_num_uses, token_type.

Describe alternatives you've considered

We could try to use a Sentinel policy on the given policy to restrict access by IP address.

Explain any additional use-cases

None.

Additional context

It seems strange that other resources would have this security feature but not LDAP.