Resurrect `broker-cluster-benchmark`

[awelzel]

          @Neverlord - I'm re-working the zeek-benchmarker code base and attempted to re-enabled the broker benchmark tests with this PR. However, `broker-cluster-benchmark` is expected to be available, but that appears to have been commented out for quite a bit.

broker/tests/CMakeLists.txt

Lines 98 to 100 in 2121956

	# add_executable(broker-cluster-benchmark benchmark/broker-cluster-benchmark.cc)
	# target_link_libraries(broker-cluster-benchmark ${libbroker} CAF::core CAF::openssl CAF::io)
	# install(TARGETS broker-cluster-benchmark DESTINATION bin)

I wanted to use that for testing to ensure nothing is breaking.. however, given there haven't been any benchmark runs for broker since 2022-02-06 that's becoming a bit modd.

I uncommenting, but the build spills a few thousand lines of c++/caf errors, so maybe a ticket to resurrect broker-cluster-benchmark is easiest?

(cc @timwoj )

Originally posted by @awelzel in #375 (comment)