Accept a Registerer instead of a Registry in PrometheusMetricsBuilder (…

…ThreeDotsLabs#204)

Accepting a prometheus.Registerer allows using prometheus.DefaultRegisterer.

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

Added extra TestConcurrentSubscribeMultipleTopics test (ThreeDotsLabs…

…#196)

* added extra TestConcurrentSubscribeMultipleTopics test + some old tests tweaks

* fix race

Expose prometheus metrics at /metrics endpoint (ThreeDotsLabs#168)

Co-authored-by: Baptiste Lefrancois <baptiste.lefrancois@ovoenergy.com>

Add Forwarder component (ThreeDotsLabs#187)

Close all subscribers in TestConcurrentSubscribe (ThreeDotsLabs#178)

Add FanOut (ThreeDotsLabs#166)

Added more poison queue context (ThreeDotsLabs#170)

added docs for router context (ThreeDotsLabs#167)

Update shortuuid library (ThreeDotsLabs#161)

Update /_example/basic/3-router example (ThreeDotsLabs#157)