Machine: use table for machine list and status outputs

[karajan1001]

Current, machine list output follows the dvc config -l. Which is not suitable in showing multiple machines. Considering use table to replace it.

$ dvc machine list
new.cloud=aws
myaws.cloud=aws
myaws.spot_price=100.00000
myaws.instance_hdd_size=10
myaws.instance_type=l
myaws.instance_gpu=k80

[dberenbaum]

Take a look at dvc remote list. It seems like dvc machine list should be similar.

[karajan1001]

Take a look at dvc remote list. It seems like dvc machine list should be similar.

It only shows name and address in dvc remote list, while machine list shows several fields.
Much less readable for users to align each line.

$ dvc remote list
ossremote	oss://dvc-temp/oss
storage	https://remote.dvc.org/example-dvc-experiments