Possibly bail when trying to add the same versioned component

[alfiedotwtf]

In src/ops/fuelup_component/add.rs's add() function, should we warn then bail if the requesting version is what we already have?

[alfiedotwtf]

Maybe not. I'm now thinking clobbering is probably the right thing to do, especially when someone accidentally kills their local toolchain

[sdankel]

If it's what they already have, I think we should print an info message and do nothing.