Add support for point-to-multipoint OSPF interfaces

[troglobit]

Description

Implement all modes supported by Frr according to: https://docs.frrouting.org/en/latest/ospfd.html#clicmd-ip-ospf-network-broadcast-non-broadcast-point-to-multipoint-delay-reflood-non-broadcast-point-to-point-dmvpn and RFC https://datatracker.ietf.org/doc/html/rfc6845.

Drop local typedef infix-ospf-interface-type in favor of the full IETF leaf interface-type.

Add confd and statd support, and a configuration migration script for existing installations.

Research use-cases and propose a test case.

Additional Information

No response

General Information

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