feat(ash_cli): add config playbook

[Nuttymoon]

Linked issues

• Fixes Configure Ash CLI depending on the current network #53

Dependencies

• Parse env variables for global args ash-rs#35

Changes

• Add the config playbook to the ash_cli role. This allows defining a default configuration through environment variables, especially for local networks that have a changing P-Chain endpoint

Additional comments

Note that the --config argument takes preference over the configuration provided through env variables.