Feature: Add --network flag to easily load Sequencer Network Default Configurations for different networks

[sambukowski]

We use Cobra to set up the cli commands, arguments, and flags. Cobra only allows for one default value for a given flag.
Currently, all of the flag defaults for the cli are set to target the dev net (dusk-#).
Similar to the --network flag in the devrunner commands, a --network flag should be added to the sequencer commands to allow for easily updating all of the potential flag values for a command to target that specific network using a config file.