Support to set options for IUDPSocket.

[wanghaEMQ]

This PR introduces three new methods to the IUDPSocket class.

setOptionReuseAddress
setOptionMulticastGroup
setOptionEnableLoopback

These methods are implemented in Net2.actor.cpp to enhance some popular functionality of UDP sockets. However, they are not implemented in sim2.actor.cpp because I’m unsure how to simulate these options in the simulation environment. Any guidance or feedback on how to address this would be greatly appreciated.

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[wanghaEMQ]

I also create a topic in foundationdb forum about adding interface set_option. https://forums.foundationdb.org/t/add-set-option-for-class-iudpsocket/4725. Any feedback or suggestion would be appreciated.