Add make targets to easily bootstrap a ZetaClient dry-mode on testnet and mainnet

[lumtis]

One of the main benefice of the ZetaClient dry-mode is to run it against live networks directly with binary built from local branch to quickly experiment new features.

Since bootstrapping a ZetaClient still require setting up config, etc.. we should look to automatize these steps and allow to easily launch it directly on testnet and mainnet

Most relevant solution is to use makefile target, eventually another solution like integrated script

make start-zetaclient-dry-mainnet
make start-zetaclient-dry-testnet

[kingpinXD]

The primary requirement for setting up these commands , would be a testnet and mainnet node which has the required communication ports exposed. Had a chat with hazim , this is something that he would be working on .

For now I am creating a separate task , to spin up a local testnet node in a docker container which can then be used to run a dry zetaclient