Feat(eos_designs): Add keys to set mlag_peer_ipv4 and mlag_peer_l3_ipv4 addresses

[gmuloc]

          > Thank you for implementing this. I tested the pull requested with my desired inventory. It works, but there are more ip pools which should be overridable.

In my fork (jmussmann@b6d177f) I added support for:

• mlag_peer_ipv4_pool
• mlag_peer_l3_ipv4_pool

let's open another issue and PR for these two as they are not targeted by the issue

Originally posted by @gmuloc in https://github.com/aristanetworks/avd/issues/4168#issuecomment-2222274775

[gmuloc]

duplicate of #4202