Add lock creation date to 'git lfs locks' output

[slonopotamus]

[slonopotamus]

CI failure isn't caused by changes in this PR.

[slonopotamus]

Before doing that, I have a question: is there any way to list locks in machine-friendly format? If no, people might parse output of git lfs locks and we would break them, so it would be safer to move lock creation timestamp to the last column.

[bk2204]

There is a --json option. I did check that before responding. Although, since you mention it, putting it at the end would be a good idea for folks who don't want to use JSON, so if we can, let's do that.

[Plataformaalgoritmica]

Hola mundo soy Max Ramírez.