[realtime] Adding 2 process tests for UDP.

[Renaud-K]

The goal of the PR is to make it possible for the realtime to stand on its own, testing wise, with its own test server.
This test server is mostly inspired from the cudaqx decoder server but in a much trimmed down version and is designed so that it can work with all transport.
The new test test_udp_two_process exercises the realtime end-to-end without requiring the runtime or cudaqx. It is designed so it can be easily parametrized to run a 3 kernel model or the unified model.

The goal would be to also consolidate the cpu_roce tests to use the same infrastructure.

[github-actions]

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[Renaud-K]

/ok to test 3114b0b

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[1tnguyen]

LGTM 👍