Added a new functionality which now enables us to add broker ports

[poushalibanik]

I have added a functionality that now enables us to add broker ports in the terminal via args. Constant broker ports are helpful in scenarios where automation comes up. The various scenarios covered are listed below:

1. When no broker ports and no broker count is provided and this command is ran "python3 -m trivup.clusters.KafkaCluster --version 3.1.0" it works as usual -> gives us port randomly that are assigned by TcpPortAllocator logic.
2. python3 -m trivup.clusters.KafkaCluster --version 3.1.0 --help -> we can see the broker port arg being added.
3. python3 -m trivup.clusters.KafkaCluster --version 3.1.0 --brokers 2 --broker-ports 1111,2222,3333 -> we can see an error stating ValueError: The number of ports :(3) does not match broker_cnt : (2)
4. python3 -m trivup.clusters.KafkaCluster --version 3.1.0 --brokers 2 -> we can see 2 brokers that are being assigned using TcpPortAllocator logic/the ones given by kernel.
5. python3 -m trivup.clusters.KafkaCluster --version 3.1.0 --brokers 3 --broker-ports 1111,2222,3333 -> allocates broker ports as 1111,2222,3333.
6. python3 -m trivup.clusters.KafkaCluster --version 3.1.0 --broker-ports 1111,2222,3333 -> it allocates the broker ports specified, if broker count is not mentioned, no. of broker ports becomes the count of brokers.
   Along with the above things, it now displays whether the broker ports being specified are available or not.