[BUG]: Client is unable to subscribe to Eventgroup with a client multicast endpoint

[chw-eng]

vSomeip Version

v3.4.10

Boost Version

1.76

Environment

Embedded Linux

Describe the bug

According to SOME/IP SD spec R22-11:
[PRS_SOMEIPSD_00846] dA SubscribeEventgroup entry reference the endpoints (IP
address, port, and protocol) where the client wishes to receive the events. A client
service could subscribe to the same Eventgroup either with a client unicast endpoint
or with a client multicast endpoint:
• If a client subscribes with a client unicast endpoint via an Endpoint Option, the
client announces its desire to receive the events as unicast events transmitted to
the given unicast endpoint.
• If a client subscribes with a client multicast endpoint via an Endpoint Option, the
client announces its desire to receive the events as multicast events transmitted
to the given multicast endpoint

But it doesn't seem current vSomeip support this option.
See the implementation of service_discovery_impl::create_eventgroup_entry:
There are only two places to create unicast endpoint for tcp and udp:
https://github.com/COVESA/vsomeip/blob/master/implementation/service_discovery/src/service_discovery_impl.cpp#L916
https://github.com/COVESA/vsomeip/blob/master/implementation/service_discovery/src/service_discovery_impl.cpp#L970

We need vSomeip to implement multicast endpoint for subscribeeventgroup to satisfy [PRS_SOMEIPSD_00846]

Reproduction Steps

No response

Expected behaviour

No response

Logs and Screenshots

No response

[goncaloalmeida]

@chw-eng This seems like a discussion, not a bug.

Would you be willing to create a PR with the necessary changes?

cc @duartenfonseca