Support multicast routing

[nhurley3]

Description

Support for multicast routing is needed for Fuchsia (see https://fxbug.dev/96216). The Fuchsia side protocols can be found here:

https://osscs.corp.google.com/fuchsia/fuchsia/+/main:sdk/fidl/fuchsia.net.multicast.admin/?q=multicast&ss=fuchsia

Support for similar methods needs to be added to gVisor. A multicast routing service will respond to events and interact with the protocol to manipulate the multicast routing table.

Is this feature related to a specific bug?

No response

Do you have a specific solution in mind?

No response

[github-actions]

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