refactor: Split in driver package, restructure files

LICENSE

driver/cleanup.go

driver/driver.go

driver/driver_test.go

driver/flag_failure.go

driver/flag_failure_debug.go

driver/flag_processing.go

driver/hetzner_query.go

driver/instrumentation_impl.go

driver/instrumentation_stub.go

driver/labels.go

driver/networking.go

driver/placement_groups.go

driver/setup.go

driver/ssh_keys.go

main.go