cmd/network: mv chain reward to reward

[ilgooz]

What do you think, it's confusing to have it under the chain namespace because it's mostly about launch.

cc @lubtd @Pantani

[lumtis]

Yes, I agree we can have directly network reward if this command has subcommands related to reward, the same as network request

For the because it's mostly about launch. reason, I didn't clearly get it, every command we have in network are related to launch

[ilgooz]

Of course they are related but chain command is for launching the chain collaboratively, pretty different comparing to other commands/functionality.

[Pantani]

make total sense for me, easier to use and less confusing