IPAM Overhaul: IPAddress SLAAC, DHCP as types

[jathanism]

Currently IPAddress still relies on the Status of SLAAC cached on the model as IPAddress.STATUS_SLAAC, which should be removed.

Additionally, DHCP is also a status that should be converted and removed as a status.

These should be replaced with a type enum field similar to Prefix.type (See: #1362).

Care needs to be taken in the approach here. For example, SLAAC is an IPv6 only option. DHCP arguably could be used for either IPv4 or IPv6 depending on implementation details.

Acceptance Criteria

Beta Give feedback

1. Remove IPAddress.STATUS_SLAAC and any associated business logic
2. Remove SLAAC Status object and IPAddressStatusChoices.STATUS_SLAAC
3. Remove DHCP Status object IPAddressStatusChoices.STATUS_DHCP
4. Implement a new IPAddressTypeChoices enum to reflect the available IPAddress types
5. Assert that SLAAC can only be used for IPv6 addresses

[bryanculver]

Closed with #3874